AlgebraHardNumber of members from a fraction and a difference
Algebra practice question
Two thirds of the members of a club came to the annual meeting. If 10 more had come, the number present would have been 40. How many members does the club have?
Answer: 45
(2/3)m + 10 = 40 gives (2/3)m = 30, so m = 45.
Common wrong answers
- If you answered 20
- 20 halves 40.
- If you answered 30
- 30 is the number who came.
- If you answered 60
- 60 multiplies 40 by 3/2 without subtracting the 10.
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