 Hi and welcome to the session. I am Neha and today I am going to help you with the following question. The question says 72% of 25 students are good in mathematics. How many are not good in mathematics? Let's see its solution. In this question, we are given that the students are good in mathematics 72% of 25 that means total students are 25 and out of 25 students 72% are good in mathematics. Now we know that 1% is equal to 1 upon 100 in fraction so that means 72% is equal to 72 upon 100. So this is equal to 72 upon 100 of means into 25. Now 125 will get cancelled by the common factor 25 and 72 and 4 will get cancelled by the common factor 4. So we will get 18. So this means that 18 students are good in mathematics. Now we have total students equal to 25. Now this implies number of the students is equal to total students 25 minus students good in mathematics that is 18 which is equal to 7. Therefore percentage of the students not good in mathematics is equal to now number of the students not good in mathematics is 7 out of 25 that is total students fraction into percentage we need to multiply it by 100. So percentage is 7 upon 25 into 100 and 25 and 100 will get cancelled by the common factor 25 and we will get 28%. 28% students are not good in mathematics and this is our required answer. With this we finish this session hope you must have understood the question goodbye and take care.