Question

The sum of three numbers is 72. One number is two times 10 and another number is three times 10. What is the third number?

Answer 1

2×10 + 3×10 = 50= 20 + 30
so then we can subtract 50 from 72
50 - 72= 22 so the other number is 22

Answer 2

the third number is 22 because 30 plus 20 is 50 and than subtract 72 from 50