Mathematical Reasoning and Aptitude
5.29
Example 135:
A certain sum of money amounts to
`
2500
in a span of 5 years and further to
`
3000 in a span of
7 years at a simple interest. The sum is
(a)
`
1800
(b)
`
2000
(c)
`
1400
(d)
`
1250
Explanation
2500 in the fifth year and 3000 in the seventh year.
Therefore, in the gap of
2 years,
`
500 has increased.
⇒
For a year, 500/2
=
250.
Thus, there is per year increase of
`
250; then in 5 years
⇒
250
×
5
=
1250
Hence, the initial amount must be 2500 – 1250
=
`
1250.
Therefore, (d) is the correct answer.
A
VERAGES
The arithmetic mean or simply ‘average’ or ‘mean’ ...
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