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A drum of petrol is `3/4` full. when 30 litres of petrol are drawn from it, it is `7/12` full. Find the capacity of the drum.

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A drum of petrol is `3/4` full. when 30 litres of petrol are drawn from it, it is `7/12` full. Find the capacity of the drum.
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Let capacity of drawn =x litres
`3/4x-30=7/12x`
`3/4x-7/12x=30`
`(9x-7x)/12=30`
`2/12x=30`
x=30*6=180 litres.
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