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

Ans. (d) 
Sol: 280x+18*550(9900)=143.8*100(14380)
280x= 14380-9900
280x= 4480
x=4480/280
x= 16

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