If the sum of two numbers is 33 and their difference is 15, the smaller number is _____ ?

– by 0

A. 14
B. 18
C. 9
D. 12

Then, x + y = 33     …(i)
and x – y = 15     …(ii)
Solving (i) and (ii), we get : x = 24, y = 9.
∴ Smaller number = 9.

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