EM-2386
Ratio and proportion
E Math · Secondary 4 · Hard · Ratio and proportion
The ratio of the number of red pens to blue pens in a box is 5 : 3. After 24 red pens are added and 12 blue pens are removed, the ratio becomes 7 : 2. How many blue pens were there in the box at first?
- 36
- 48
- 60
- 24
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