Question
Which of the following chemical substances has its
formula incorrectly paired?Solution
The chemical formula for chloroform is CHCl₃, not CHCl₂. The rest of the substances are correctly matched with their chemical formulas: Acetic acid (CH₃COOH), Ethanol (CH₃CH₂OH), and Methane (CH₄).
414 ÷ 23 × 38 – 154 + 264 = ?
...25% of {(5/18) × 2880 + 122 } = ?% of 590
Find the simplified value of the following expression:
62 + 122 × 5 - {272 + 162 - 422}
- What will come in place of (?), in the given expression.
(5³ + 3²) × 2 = ? Calculate the simplified value of the given expression:

(53 + 480 ÷ 4)% of 20 = ?% of 70
9 × 4 ? ÷ 16 = 144
16 of 25 - 12 of 15 = ? of 5 of 11
∛857375 + ∛91125 = ? + √6889