Question
39.9% of 1720 + 80.2% of 630 = 89.9% of 1280 +
? What approximate value should come in place of question mark (?) in the following equations?Solution
39.9% of 1720 + 80.2% of 630 = 89.9% of 1280 + ? 40% of 1720 + 80% of 630 = 90% of 1280 + ? 688 + 504 = 1152 + ? ? = 40
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