Question

The sum of two numbers is 66. The smaller number is 18 less than the larger number. What are the numbers?

Answer 1

x+y=66
x-18=y

x+x-18=66
2x=66+18
2x=84
x=84/2
x=42

y=x-18
y=42-18
y=24

Check:
42+24=66

42-18=24

Good luck.