(98.03 + 186.98) ÷ 19.211 = 89.9 – 20.23% of ?
(98 + 187) ÷ 19 = 90 – 20% of ? 285 ÷ 19 = 90 - 20% of ? 90 - 15 = 20% of ? 75 = 20/100 x ? ? = 375
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