Shawn's answer to Rayner Tay's Primary 5 Maths Rate & Ratio Singapore question.
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Tank x,
20 mins —> 1 tank
1 min —> 1/20 tank
Tank y,
10 mins —> 1 tank
1 min —> 1/10 tank
X+Y in 1 min —> 1/20+1/10=3/20 tank
3/20 tank —> 1 min
1/20 tank —> 1/3 min
20/20 tank —> 20/3 min = 400s = 6mins 40sec
20 mins —> 1 tank
1 min —> 1/20 tank
Tank y,
10 mins —> 1 tank
1 min —> 1/10 tank
X+Y in 1 min —> 1/20+1/10=3/20 tank
3/20 tank —> 1 min
1/20 tank —> 1/3 min
20/20 tank —> 20/3 min = 400s = 6mins 40sec
Date Posted:
1 month ago
Sorry it should be tap x and tap y
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