Question

The sum of three numbers is 90. The third number is 10 less than the first. The second number is 3 times the third. What are the numbers?

Answer 1

16

26

48

Explanation:

x + y + z = 90

z = x - 10 => x = z + 10

y = 3z

=>

(z+10) + 3z + z = 90

5z + 10 = 90

5z = 80

z = 16

x = z + 10 = 16 + 10 = 26

y = 3z = 3×16 = 48