MATHS
posted by RS on .
Charis and shermin are given money each. If Charis and shermin spend $60 and $30 each day respectively. Charis will still have $600 when Shermin has spent all her money. If Charis and Shermin spend $30 and $60 each day respectively. Charis will still have $1500 when Shermin has spent all her money. How much money is given to each girl?

If the time periods are a and b days, respectively,
600+60a = 1500+30b
30a = 60b
a=20 b=10
So
Charis had 1800
Shermin had 600
check:
180020*60 = 600
180010*30 = 1500
60020*30 = 0
60010*60 = 0