Simple Arithmatic

# Arithmetic & Mental Ability – 9 Average of 15 persons is 24 years later a boy is included in to this group then average becomes 23 years. The age of the boy will be

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The length of a rectangular plot is 20 metres more than its breadth. If the cost of fencing the plot @ 26.50 per metre is Rs. 5300, what is the length of the plot in metres?
a) 40
b) 50
c) 120
d) None of these

A discount series of 10%, 20% and 40% is equal to a single discount of
a) 50%
b) 56.80%
c) 70%
d) 70.28%

A man driving at ¾th of his original speed reaches his destination 20 minutes later than the usual time. Then the usual time is
a) 45 minutes
b) 60 minutes
c) 75 minutes
d) 120 minutes

Average of 15 persons is 24 years later a boy is included in to this group then average becomes 23 years. The age of the boy will be
a) 22
b) 8
c) 18
d) 12

Average age of A B and C is 36yr. If average age of B and Cis 30yr and age of B is 22yr, then what is the sum of the ages of A and C?
a) 68yr
b) 86yr
c) 58yr
d) 61yr

How many 8's are there in the following number sequence which are immediately followed by 5 but not immediately preceeded by 3? 856 8 58 57 3 8 5 2 8 5 6 3 8 5 7 8 5 3 2 5 85
a) 5
b) 6
c) 7
d) 4

If ‘IN’ is written as ‘KQ’ then ………. will be written as FR?
a) EO
b) DO
c) DP
d) EP

If a sum of money placed at compound interest, compounded annually, doubles itself in 5 years, then the same amount of money will be 8 times of itself in
a) 26 years
b) 20 years
c) 15 years
d) 10 years

The true discount on a bill due 9 months hence at 16% per annum is Rs. 189. The amount of the bill is:
a) Rs. 1386
b) Rs. 1764
c) Rs. 1575
d) Rs. 2268

Select the one which is different from other three responses.
a) 43
b) 53
c) 63
d) 73

Rajeev read 3/8 part of a book in one day. Next day he read 4/5 part of the rest. Now 30 pages are left to read. How many pages are in the book?
a) 360
b) 1200
c) 240
d) 120

The marked price of an article is 20% more than its cost price. A discount of 20% is given on the marked price. In this kind of sale, the seller bears
a) no gain, no loss
b) 4% loss
c) 4% gain
d) 8% gain

A man purchased an article at 3/4th of the listed price and sold at half more than the listed price. What was his gain percentage?
a) 25%
b) 50%
c) 75%
d) 100%

Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the same job. How long it take both A & B, working together but independently, to do the same job?
a) 40/9 days
b) 40/7 days
c) 7.5 days
d) 8.5 days

The average marks of 32 boys of section A of class:X is 60 whereas the average marks 40 boys of section B of class X is 33. The average marks for both the sections combined together is
a) 44
b) 45
c) 46½
d) 45½

A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
a) 2 hours
b) 3 hours
c) 4 hours
d) 5 hours

3, 5, 11, 14, 17, 21 (Odd man out)
a) 21
b) 17
c) 14
d) 3

If 25% of a number is added to 20, the result is 50% of the number then the number is
a) 50
b) 100
c) 80
d) 400

The difference between the length and breadth of a rectangle is 23 m. If its perimeter is 206 m, then its area is:
a) 1520 m2
b) 2420 m2
c) 2480 m2
d) 2520 m2

At a game of billiards, A can give B 15 points in 60 and A can give C to 20 points in 60. How many points can B give C in a game of 90?
a) 30 points
b) 20 points
c) 10 points
d) 12 points

The difference between simple and compound interest for an amount in 2 years is Rs. 32. If the rate of interest is 8%, then the amount is:
a) Rs. 10000
b) Rs. 1000
c) Rs. 5000
d) Rs. 2500

[1³+2³+3³+…..+9³+10³] is equal to
a) 3575
b) 2525
c) 5075
d) 3025

A can run 22.5 m while B runs 25 m. In a kilometre race B beats A by:
a) 100 m
b) 25 m
c) 50 m
d) 101m

.06 of a number is equal to .08 of another number. The ratio of the two numbers will be
a) 3:4
b) 4:3
c) 2:15
d) 2:9

a+b-C+100=350. If a = 2b and b=2c What is the value of c
a) 30
b) 50
c) 70
d) 90 