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
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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%
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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
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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
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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
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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
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If ‘IN’ is written as ‘KQ’ then ………. will be written as FR?
a) EO
b) DO
c) DP
d) EP
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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
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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
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Select the one which is different from other three responses.
a) 43
b) 53
c) 63
d) 73
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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
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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
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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%
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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
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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
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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
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3, 5, 11, 14, 17, 21 (Odd man out)
a) 21
b) 17
c) 14
d) 3
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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
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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
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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
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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
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[1³+2³+3³+…..+9³+10³] is equal to
a) 3575
b) 2525
c) 5075
d) 3025
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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
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.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
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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
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