AC Lim's answer to liang liang's Secondary 2 Maths Singapore question.
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Volume of cylinder = 5/3 × 21 = 35L
Cause volume of conical part is 3/5 × ⅓ of cylinder.
3/5 × ⅓ = 7
3/5 = 21
5/5 = 35
Then total = 35 +7 =42L