Question

Marsha does 15% of her homework in study hall. If she spent 45 minutes on homework in study hall, how much time in minutes does she need to spend on homework altogether? please show work

Answer 1

There is no need to add another 45 mins. 300 mins is already the total time taken she needs to completed her hw. 300 mins is 100% of the time taken she spent to do her hw.

Answer 2

15/100

45/x

cross multiply to get 15x = 4500

x = 300 minutes. 300 + 45 = 345 minutes in total.