Question
840 400 180 ? 15
-12.5 What should come in place of the question mark (?) in the following number series:Solution
840 ÷ 2 - 20 = 400 400 ÷ 2 - 20 = 180 180 ÷ 2 - 20 = 70 70 ÷ 2 - 20 = 15 15 ÷ 2 - 20 = -12.5
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