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Which equation says 'when a number is subtracted from 45, the result is 18'?

Class 7Simple EquationsSimple Equations
  • A
  • B
  • C
  • D

Step-by-Step Solution

' subtracted FROM 45' means start at 45 and take away: , so and 45 − 27 = 18 ✓. Writing reverses the order — the commonest wording trap in this chapter — and would give . The last option swaps the result and the starting number.
Answer: A)

Key idea: Translating word problems into equations

Three steps:
1. **Pick a variable** for the unknown ('let be the number of …').
2. **Translate the words into an equation** using the operations the problem describes.
3. **Solve and answer in the original units.**

Example: 'Three times a number plus 7 equals 22. Find the number.'
Let = the number. Equation: . Solve: .
Answer: the number is 5.

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