Answer:
See below!
Step-by-step explanation:
Let the two numbers be x and y
Condition # 1:
x + y = 66 ----------------(1)
Condition # 2:
2x = y + 15
2x - y = 15 ---------------(2)
Add both equations
x + y + 2x - y = 66 + 15
x + 2x = 66 + 15
3x = 81
Divide both sides by 3
x = 27
Put x = 27 in Eq. 1
27 + y = 66
Subtract 27 to both sides
y = 66 - 27
y = 39
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