PSLE Math 2021 Paper 2 Question 17
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(Volume and Rate of Tap A and Tap B Question)
PSLE Math 2021 Paper 2 Question 17
a) Ans: 4.65L
Vol. of water→ 12 × 55 × 20 × 30 = 16500
16500cm^3 = 16.5L
A: 2pm —(15 min)→ 2.15pm
B: 10 min
Water (Tap A) → 15 × 4.2 = 63
Water (Tap B) → 63 - 16.5 = 46.5
1 min → 46.5 ÷ 10 = 4.65
b) Ans: 13/44
Vol. of water flow out from B → 15 × 4.65l = 69.75L
Vol. of water in the tank → 16.5L + 63L - 69.75L = 9.75L
Fraction of water in the tank → 9.75/(16.5 × 2) = 13/44
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