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Solution: The sentence given in the question is correct: Water contamination has become more serious since chemists have begun to use new substances.
? = 2640 ÷ {(35% of 1240) – 170}
1780 – 60 ÷ 4 x 80 = ?
What will come in place of (?) in the given expression.
[(24 ÷ 3) + (18 × 2)] - 5 = ?
756 + 432 – 361 + ? = 990
31% of 1900 - ? = 73
420 ÷ 7 + 140 % of 20 + ? × 13 = 18 × 15
(49 x ?) / 3.5 + 389 = 627