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## Question

primary 5 | Maths
| Fractions

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5h fill 1 tank

1h fill 1/5 tank

B:

6h fill 1 tank

1h fill 1/6 tank

C:

3h fill 1 tank

1h fill 1/3 tank

together, 3 taps fill

1/5 + 1/6 + 1/3 = 7/10

[ 1/5 + 1/6 + 1/3 = 1/5 + 1/6 + 2/6

= 1/5 + 3/6

= 1/5 + 1/2

= 2/10 + 5/10

= 7/10

]

...

### See 1 Answer

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