(? % of 280) + (18% of 550) = 143.8
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Answer: The unknown quantity (?) is 16.
Step-by-step explanation: Let, the unlnown variable be x.
(x% of 280) + (18% of 550) = 143.8
or, (x/100 x 280) + (18/100 x 550) = 143.8
or, 2.8x + 99 = 143.8
or, 2.8x = 143.8 - 99
or, 2.8x = 44.8
or, x = 44.8/2.8
or, x = 16
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