Question
(23.99)2 – (17.99)2 +
(1378.98 + 44.99) ÷ ? = 608 What approximate value should come in place of question mark (?) in the following questions? (You need not to calcualte the exact value)Solution
(23.99)2 – (17.99)2 + (1378.98 + 44.99) ÷ ? = 608 => (24)2 – (18)2 + (1379 + 45) ÷ ? = 608 => 576 - 324 + 1424 ÷ ? = 608 => 1424 ÷ ? = 356 => ? = 1424/356 => ? = 4
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