If 5 x 4 = 15, 7 x 8 = 49 and 6 x 5 = 24, then 8 x 4 is equal to - mathselab.com

If 5 x 4 = 15, 7 x 8 = 49 and 6 x 5 = 24, then 8 x 4 is equal to

Question


If 5 x 4 = 15, 7 x 8 = 49 and 6 x 5 = 24, then 8 x 4 is equal to


A. 30
B. 28
C. 24
D. 26


Answer: C. 24


Solution:

As,                5 x 4 = 5 x (4 -1) = 5 x 3 = 15

                    7 x 8 = 7 x (8 – 1) = 7 x 7 = 49

and               6 x 5 = 6 x (5 – 1) = 6 x 4 = 24

Similarly,       8 x 4 = 8 x (4 – 1) = 8 x 3 = 24





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