the sum of two numbers is 20.one number is 3 time the other number . find the two numbers?
a = first numbner
b = second number
b = 3 a
a + b = 20
a + 3 a = 20
4 a = 20 Divide both sides by 4
a = 5
b = 3 a = 3 * 5 = 15
The two numbers:
5 and 15