Question
If 56 x 11 = 9, 37 x 13 = 6, 42 x 12 = 3
then find the value of 87 x 77 = ?
A. 4
B. 3
C. 5
D. 1
Answer: D
Solution:
(5 + 6) – (1 + 1) = 9
(3 + 7) – (1 + 3) = 6
(4 + 2) – (1 + 2) = 3
then (8 + 7) – (7 + 7) = 1
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