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What should come in place of the question mark (?) in the following questions?

?% of 280 + 18% of 550 = 143.8 (a) 11 (b) 18 (c) 21 (d) 16 (e) None of these

Your Answer

(?/100)*280+(18/100)550=143.8
(?*28 + 18*55)/10 =1438/10
?*28 +18*55 =1438
?*28 + 990=1438
?*28 = 1438-990
?*28 = 448
? = 448/28
? = 16

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