AlgebraVery hardGroup size from a fraction and a remainder
Algebra practice question
Three fifths of the members of a choir are sopranos, and the remaining 12 members are altos. How many members does the choir have?
Answer: 30
(3/5)m + 12 = m gives (2/5)m = 12, so m = 30.
Common wrong answers
- If you answered 18
- 18 is the number of sopranos.
- If you answered 20
- 20 divides 12 by 3/5.
- If you answered 60
- 60 multiplies 12 by 5.
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