452 + 312 ÷ 13 = 34 * ?
=> 452 + 312/13 = 34 * x
=> 452 + 24 = 34 * x
=> x = 476/34 = 14
1.5 % of 4600 + 2.8% of 2000 - 109 = ? ? = 16
120 % of 750 ÷ 25 - 16 = ? % of 1240 ÷ 31 ? = 50
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