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Question
primary 5 | Maths
| Rate & Ratio
2 Answers Below
Anyone can contribute an answer, even non-tutors.
help asap pls. Thanks
Date Posted: 3 months ago
Views: 108
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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
Sorry it should be tap x and tap y
thanks!
Alternate method:
Since tap Y takes half the time than tap x, the rate is 2 times of X.
Tap X —> 20 mins
3 Tap X —> 20/3 mins = 6m 40s
Since tap Y takes half the time than tap x, the rate is 2 times of X.
Tap X —> 20 mins
3 Tap X —> 20/3 mins = 6m 40s
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