JAMB 1988 · UME · Q5

Two sisters, Taiwo and Kehinde, own a store. The ratio of Taiwo's share to Kehinde's is 11:911 : 9. Later Kehinde sells 23\frac23 of her share to Taiwo for ₦720.00. Find the value of the store.

Worked solution (try it first)
  1. The ratio 11:911 : 9 has 20 parts, so Kehinde owns 920\frac{9}{20} of the store.
  2. She sells 23\frac23 of that: 23×920=310\frac23 \times \frac{9}{20} = \frac{3}{10} of the store, for ₦720.
  3. So one tenth is 720÷3=720 \div 3 = ₦240, and the store is worth 10×240=10 \times 240 = ₦2,400, option B.

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