child's homework

[cascath]

In 1 hour, 8 teachers can mark 90 exam papers.  How many exam papers can 15 teachers mark in 1 and a half hours?

Could someone please tell me if this is correct.

90 divide by 8 = 11.25 = 1 teacher per hr

15 x 11.25 = 168.75 = 15 teachers in an hour.

168.75 divide by 2 = 84.37 = 15 teachers in half an hr

168.75 + 84.37 = 253.12

Please help.  I need a refresher course for sure.

[sddsddean]

I did it a different way and got 253.125, so I think you are correct.

[forgetfultel]

I can't fault your maths, but these sort of questions usually come out to a nice round number - I think you've got it right - I made it 253.125.

[hobbitess]

Ditto