What number should replace the question mark - www.mathselab.com (2)

What number should replace the question mark?

Question


What number should replace the question mark?



A. 214
B. 114
C. 218
D. 96


Answer: C. 218


Solution:


Square 1:

11 x 7 = 77 …(I)

17 x 9 = 153 …(II)

Difference between (I) & (II): 153 – 77 = 76


Square 2:

13 x 11 = 143 …(I)

17 x 11 = 187 …(II)

Difference between (I) & (II): 187 – 143 = 44


Square 3:

27 x 8 = 216…(I)

31 x 14 = 434…(II)

Difference between (I) & (II): 434 – 216= 218


Hence, the answer is 218.





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