5) In a maths class the ratio of pupils that had done their homework to those that had not is 5:4. 15 pupils had done their homework. The teacher said they would collect the
homework the next day. The next day, the ratio of those who had done it to those that
had not was 2:1.
The teacher said that only 3 more pupils had done their homework. Could the teacher
be correct?
You must show all of your working.

the teacher is correct

Step-by-step explanation:

5:4 totals 9

5/9 of y pupils did their home work

5/9 x y=15

5y=15x9

y =15x9/5

y=27

there are 27 students

next day, 2/3of 27 students did their assignment

2/3 x 27=18

difference between the two days 18-15=3

the teacher is correct

well there are two answers for that.

1: you need 120 ones then that will equal up to 120.

2: you could also do one 100 and 2 tens.

those are the answers that i have thought of.