I hope that the number of students in class 61 is 90% of that in class 62. There are four less students in class 61 than in class 62. How many students are there in class 61? A box of 200 bags of biscuits. The ratio of the number of bags sold in the first day to the total number of bags is 1:5. The next day, 30% of the total number of bags sold. How many bags of biscuits are left?

I hope that the number of students in class 61 is 90% of that in class 62. There are four less students in class 61 than in class 62. How many students are there in class 61? A box of 200 bags of biscuits. The ratio of the number of bags sold in the first day to the total number of bags is 1:5. The next day, 30% of the total number of bags sold. How many bags of biscuits are left?

1.100%-90%=10% 4/10%=40 40-4=36
The number of people in a class is 36
2.200*1/5=40 200*30%=60 60+40=100 200-100=100
100 bags left