Question
66.05 × 17.95 – 38.99 × 18.12 = (60 + ?) ×
6 Â What is the approximate value that should come in place of question mark (?) in the following questions? (You are not needed to calculate the exact value)Solution
66.05 × 17.95 – 38.99 × 18.12 = (60 + ?) × 6 66 × 18 – 39 × 18 = (60+?) × 6 18 (66 -39) =  (60+?) × 6 18 × 27 =  (60+?) × 6 81 = 60 + ? ? = 81 - 60 = 21 = Approx 20
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