AC Lim's answer to riz's Primary 6 Maths Fractions Singapore question.
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Backward calculation. Hope this helps
Date Posted:
4 years ago
Set A to have 35 units.
Set B to have 5 units*.
After giving away 4/7 of A to B,
Then set A to have 15 units left.
Then set B to have 5 units* + 20units.
After giving away 2/5 of B to A again,
Set A - 15 units + 8 units + 2 units*
Set B- 3 units* + 12 units
Since A and B are the same, we have
1 unit* = 11u,
90units -756
35 units-294 (A)
55 units-462 (B)
Set B to have 5 units*.
After giving away 4/7 of A to B,
Then set A to have 15 units left.
Then set B to have 5 units* + 20units.
After giving away 2/5 of B to A again,
Set A - 15 units + 8 units + 2 units*
Set B- 3 units* + 12 units
Since A and B are the same, we have
1 unit* = 11u,
90units -756
35 units-294 (A)
55 units-462 (B)
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