The total monthly incomes of 15 men is $31500.
45 of them earn the same monthly income each. Each of the remaining men earns 3 times as much per month. Find the difference between the higher monthly income and the lower monthly income.
|
Men with lower incomes |
Men with higher incomes |
Total incomes |
Number |
12 |
3 |
|
Value |
1 u |
3 u |
|
Total value |
12 u |
9 u |
21 u |
Number of men with lower incomes
=
45 x 15
= 12
Number of men with higher incomes
= 15 - 12
= 3
Total monthly incomes
= 12 u + 9 u
= 21 u
21 u = 31500
1 u = 31500 ÷ 21 = 1500
Difference between the higher monthly income and the lower monthly income
= 3 u - 1 u
= 2 u
= 2 x 1500
= $3000
Answer(s): $3000