More advanced ratio problem--with Algebra (HD version)

[MyFabiola23]

oh hahahah my teacher showed me this one

[GenericCoder]

good here is another way to solve it. Here is another way to solve this. Let x = the number of we multiply apples and oranges by to get that ratio. then we know 5x/8x = 5/8; So 5x-15/8x = 1/4; 5x - 15 = 2x; 3x = 15; x = 5; So now we now how many groups are there we just multiply 5(5) - 15 + 8(5) = 10 + 40 = 50; I hope that makes sense.

[robertslistening]

but we know that the ratio, but we know that the ratio, but we know that the ratio of ...so when I take away 15, when I take away 15, when I take away 15 apples...

You're teaching is useful, but you repeat statements an irritating number of times. You should listen to yourself. I'm not sure whether this a redundant teaching technique or what, but every video has this.

[manq211]

you don't even need algebra to solve this question, i calculated this in my head, i multiplied 5 apples by 5 and also 8 oranges by 5 and i got 25 over 40, then i subtracted 15 apples from 25 and got 10 apples over 40 oranges then i divided both by 10 and it was 1 over 4. then 25+40=65-15 apples =50 pieces of fruits

[marioandWEEGEE2]

???I AM COMPLETELY LOST

[jobarlives]

I too prefer the scaling method presented by spykiss72 one year ago in the comments. ie.,

"the ratio 5/8 (apples to oranges) = 5x/8x for every positive x. Remove 15 apples and the ratio becomes (5x-15)/8x = 1/4. Solve for x (x=5) to determine there were 5x=25 apples and 8x=40 oranges" jb

[metalwii]

part 2/2 of comment

so i took the numbers and subtracted 15 from them, then divided them by the oranges. 20-15=5 5/32 is not equal to 1/4 i did this and i found one that works. 25-15= 10 10/40= 1/4 now i know there are 10 apples and 40 oranges 10+40=50 there are 50 fruits in total!

hopefully this helped you!

i might make a video for this and post it in the video response if i get time.........

[metalwii]

part 1/2 of comment

here is another way to solve the problem. you know the ratio is 5:8 so i wrote some of the 5 times table down and some of the 8 times table

5,10.15,20,25,30,35,40,45,50,5­5,60,65-----apples

8,16,24,32,40,48,56,64,72,80,8­8,90,104-----oranges

so if there is 5 apples there are 8 oranges. if there are 30 apples there are 48 oranges the ratio is still the same 5:8. now is did trail and error. if u subtract 15 from apples and divide it from oranges you get 1/4

[soney8888]

Wow, I dont understand why he makes this problem so complictaed than the problem actually is. This is easy problem and can be solved less than 2 minutes without all these writing and the time.

[DeusAmadeus1]

Do mean "my response to this video"?

On the contrary, I think it has order... There is actually a list in their website...

[haroldchode]

Hi @fahmad27, spamming comments is bad, try not to do that in the future. But it looks like the 13 comes from just the total number of fruit.

5 apples, and 8 oranges... 5+8=13. He seems to be talking about a ratio in terms of the total number of fruit.

Hope that helps. (:

[fahmad27]

Where did he get the 13 from in the "apples/oranges" problem?

[fahmad27]

Where did he get the 13 from in the "apples/oranges" problem?

[fahmad27]

Where did he get the 13 from in the "apples/oranges" problem? I don't get it!!

[fahmad27]

Where did he get the 13 from in the "apples/oranges" problem? I don't get it!!

[carlosyt2]

i just did 5x-15 / 8x = 1/4....then i found the LCD for the denominators by multiplying across (32x), then i multiplied each fraction by that (just pu it on top and then divide the denominator so you cancel it out, then miltiply the rest to the numerator). Then just solve for X. ORRRR...my second choice...cross multiply.. =]...still loving tha tutorials =D

[GetMeThere1]

The solution was apparent as soon as he finished writing> 1/4 = 2/8, so 15 apples represented 3/8 of the oranges (5/8 - 2/8). That means 1/8 of the oranges is 5, so total oranges is 40. 5/8 of that is 25.

Originally there were 25 apples and 40 oranges, then there were 10 apples and 40 oranges.

[haroldchode]

HD looks good.

I appreciate you sharing your time and talent.

[fahmad27]

@haroldchode Can you please tell me where did he get 13 from at 3:25?

[spykiss72]

Your discussion on apples and oranges is too complicated. Almost all ratio problems can be more simply solved by scaling. For example, the ratio 5/8 (apples to oranges) = 5x/8x for every positive x. Remove 15 apples and the ratio becomes (5x-15)/8x = 1/4.  Solve for x (x=5) to determine there were 5x=25 apples and 8x=40 oranges. Simple.

[eloexplorer]

@spykiss72

he explains how to solve the equation differently in another video which is less complicated. no matter how complicated the equation is,the points is, he EXPLAINS the logic of of a formula instead of just using it. also, it's better to know more ways how to solve a problem instead of sticking to only one formula.

[calebstube]

@eloexplorer yes being able so see why you did what you did is important too

[densags]

@spykiss72 ; I understand your explanation. However I appreciate the effort of the man behind this voice :)

[XxAres21xX]

@spykiss72 '

I agree i got lost in the middle of it XD

[topmodel5k]

@spykiss72 please show how you got 1/4

[thebillybobhobillybo]

@topmodel5k in case this answer isn't too late, he was saying that 5 and taking away 15 apples which is 5-15 over 8 oranges will equal the ratio of 1/4 like he said in the beginning of the problem.

[topmodel5k]

@thebillybobhobillybo thanks lol

[Swetlana0]

The new HD versions you have started are great to watch and learn!

Keep up the good work.

~Swetlana~