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primary 6 | Maths
| Fractions
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D: 2/5 = u
5/5 = 2.5u
E: 3/4 = u
4/4 = 4u/3
F: 2/3 = u
3/3 = 1.5u
2.5u + 4u/3 + 1.5u = 1440
u = 270
each girl used 270 beads
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