PSLE Math 2019 Paper 2 Question 8
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(Black and White Beads Before-Change-After Question)
PSLE Math 2019 Paper 2 Question 8
(a) Ans: 11/32
Method 1: Model
used/total = 4.5u + 1u/16u = 11/32
Method 2: Ratio
1/4 of 8u = 2u
3/8 of 24u = 9u
used/total = 9u + 2u/24u +8u = 11/32
(b) Ans: 96
Method 1: Model
7.5u + 3u = 63
10.5u = 63
1u = 63 ÷ 10.5 = 6
16u = 16 × 6 = 96
Method 2: Ratio
15u + 6u = 21u
21u → 63
1u → 63 ÷ 21 = 3
32u → 32 × 3 = 96
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