Two Fibonacci Problems

[xAmpersand]

First one is easy; second one is a little harder, but i got it by finding the average of 4, 5, and 6; which is 5, then divide by three; which is 1 and 2/3.

[messakg123]

(1/4+1/3)l=21

(3/12+4/12)l=21

7l/12=21

l=12x21/7

=12x3

=36

[Libervurto]

I did the tree one a weird way but maybe this helps.

1/4 + 1/3 is under ground so I need to subtract the sum from 1 to find the portion above ground.

To add them together we need a common denominator: 12, so 3/12 + 4/12 = 7/12.

So 5/12 is above ground.

We know 21 palmi is underground (which is 3*7) so I did 5*3 = 15 palmi above ground. Above ground + below ground = 36 palmi.

I didn't catch on that 7/12 means a 12p tree would have 7p underground so 21/7=3, 3*12=36, 21/36=7/12, Answer is 36.

[cembry90]

Good exercise ;)

1/4 + 1/3 = 3/12 + 4/12 = 7/12

7/12 = 21 palmi [below ground]

21/7 = 3 palmi [1/12 total size]

12*3 = 36 palmi [total size]

[eltotoX]

Sweet problems! I couldn't do the first one but the second one came easy.