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Standard VII
Mathematics
Question
A number reduced by
25
%
becomes
225
. By what per cent should it be increased so that it becomes
375
?
25
%
30
%
75
%
35
%
A
25
%
B
30
%
C
35
%
D
75
%
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Solution
Verified by Toppr
(a) Let the number be
x
.
Then,
(
x
−
25
100
x
)
=
225
⇒
75
x
100
=
225
.
⇒
x
=
225
×
100
75
=
300
.
Let the number
300
be increased by
a
%
to get
375
.
Then,
300
+
a
100
×
300
=
375
⇒
=
3
a
=
375
−
300
=
75
⇒
a
=
25
%
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