alan and scott own a sum of money.alan owns 90%.if he gives $16 to scott,he will own 85% of the mone

题目

alan and scott own a sum of money.alan owns 90%.if he gives $16 to scott,he will own 85% of the money.how much money do they own

答案

set x as the money they have
then alan owns 90%x
90%x-85%x=16
5%x=16
x=320
then own $320