Question

30-20=40,20-15=20, then 50-30=?
(A) 60
(B) 70
(C) 80
(D) 90​

Answer 1

Answer:

30-20 = 10, 10×4 = 40.

20-15 = 5, 5×4 = 20,

50-30= 20, 20×4 = 80.

Therefore, 50-30= 80.

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