A drum of kerosene oil is 3/4 full. When 15 litres of oil is drawn from it, it is 7/12 full. Find the total capacity of the drum.
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1
Let the total capacity be
x
.
According to the question,
(
3
x
4
)
−
15
=
(
7
x
12
)
3
x
−
60
4
=
(
7
x
12
)
3
x
−
60
(
12
)
=
(
7
x
)
×
4
36
x
−
720
=
28
x
36
x
−
28
x
=
720
8
x
=
720
x
=
90
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