J's answer to Tsl's Primary 5 Maths Fractions Singapore question.
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Tank A took 5h to fill tank. So in 1h it fills 1/6 of it.
Tank B took 5h to fill tank. So in 1h it fills 1/5 of it.
Tank C took 3h to fill tank. So in 1h it fills 1/3 of it.
So if all 3 were turned on at the same time,fraction of the tank that's filled in 1h
= 1/6 + 1/5 + 1/3
= 5/30 + 6/30 + 10/30
= 21/30
= 7/10
Tank B took 5h to fill tank. So in 1h it fills 1/5 of it.
Tank C took 3h to fill tank. So in 1h it fills 1/3 of it.
So if all 3 were turned on at the same time,fraction of the tank that's filled in 1h
= 1/6 + 1/5 + 1/3
= 5/30 + 6/30 + 10/30
= 21/30
= 7/10
Date Posted:
5 years ago
Thank you very much for helping resolved the math problems
Thank you very much for helping resolved the math problems
Welcome. The way to add the fractions up is to change the denominator to the same one. Then simplify the final fraction. There's a typo, it should be Tap instead of Tank
Well noted with thanks
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