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The sum of two numbers is 84. One number is 6 more than the other. What is the smaller of the two numbers?

A 39
Explaination
Let "x" be the smaller number
x + 6 = the bigger number
The sum of the smaller and the bigger number is 84, hence:
x + (x + 6) = 84
2x + 6 = 84
2x = 78
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B 35
C 32
D 33