Simple Arithmatic

# Arithmetic & Mental Ability – 18

The measures (in cm) of sides of a right angled triangle are given by consecutive integers. Its area (in cm²) is

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A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in
a) 7 days
b) 15 days
c) 12 days
d) 10 days

Average of 80 numbers are 42. 5 more numbers included, the average of 85 numbers become 45. Find the average of 5 numbers.
a) 82
b) 89
c) 93
d) 98

The radius of the base and height of a right circular cone are in the ratio 5:12, If the volume of the cone is 314cm³, the slant height (in cm) of the cone will be
a) 12
b) 13
c) 15
d) 17

Find the difference between simple interest and compound interest on Rs. 2500 for 2 years at 6% per annum is:
a) Rs. 9
b) Rs. 90
c) Rs. 2509
d) Rs. 191

The measures (in cm) of sides of a right angled triangle are given by consecutive integers. Its area (in cm²) is
a) 9
b) 8
c) 5
d) 6

From the given alternatives, select the word which cannot be formed using the letters of the word COURAGEOUS
a) Secure
b) Argue
c) Course
d) Grace

Which one of the following is not a prime number?
a) 31
b) 61
c) 71
d) 91

In a row of boys Rajan is 10th from the right and Suraj is 10th from the left. When Rajan and Suraj interchange their positions Suraj will be 27th from the left which of the following will be Rajan’s position from the right?
a) 10th
b) 26th
c) 29th
d) 27th

The sum of three numbers is 174 the ratio of second number to the third number is 9:16 and the ratio is the first to the third is 1:4. The second number is
a) 24
b) 96
c) 48
d) 54

835, 734, 642, 751, 853, 981, 532 (Odd man out)
a) 751
b) 853
c) 981
d) 532

Seats for Maths, Physics and Biology are in the ratio of 5:7:8 respectively. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the respective ratio of increased seats?
a) 2:3:4
b) 6:7:8
c) 6:8:9
d) can’t be determined

which is different from the other three responses
a) Pathology
b) Histology
c) Haematology
d) Archaeology

The banker's discount on a sum of money for 3/2 years is Rs. 558 and the true discount on the same sum for 2 years is Rs. 600. The rate percent is:
a) 10%
b) 13%
c) 12%
d) 15%

Select the one which is different from other three responses.
a) News paper
b) Press
c) Edition
d) Audition

10 cats caught 10 rats in 10 seconds. How many cats are required to catch 100 rats in 100 seconds
a) 100
b) 10
c) 20
d) 50

Find the odd one
a) CXGT
b) EVBY
c) DXEY
d) AZDW

In a code language ‘mu kay cit’-, means ‘very lucky person’ and ‘dis hu mu’ means ‘fortunate and lucky’ which is the word for lucky in that language?
a) mu
b) kay
c) cit
d) dis

Showing a lady, Ramu said, “She is the daughter of my grand father’s only son”. How is Ramu related to that lady?
a) brother
b) brother in law
c) uncle
d) father

Choose the correct sequence 1. select 2. seldom 3. send 4. selfish 5. seller
a) 1, 5, 2, 4, 3
b) 2, 1, 5, 4, 3
c) 2, 1, 4, 5, 3
d) 2, 5, 4, 1, 3

A train is moving at speed of 132kmph. If the length of the train is 110 meters, how long will it take to cross a railway platform 165 m long?
a) 6.0 s
b) 7.5 s
c) 7.0 s
d) 8.5 s

(7.5×7.5+37.5+2.5×2.5) is equal to
a) 100
b) 80
c) 60
d) 30

A is twice as good workman as B, and together they complete a work in 15 days. In how many days can the work be complete by B alone?
a) 25 days
b) 45 days
c) 35 days
d) 40 days

In a shower, 5 cm of rain falls. The volume of water that falls on 1.5 hectares of ground is:
a) 75 cu. m
b) 750 cu. m
c) 7500 cu. m
d) 75000 cu. m

The average age of eleven cricket players is 20 years. If the age of the coach is also included, the average age increases by 10%. The age of the coach is
a) 48 years
b) 44 years
c) 40 years
d) 36 years

Instead of multiplying a number by 0.72, a student multiplied it by 7.2. If his answer was 2592 more than the correct answer, then the original number was
a) 400
b) 420
c) 500
d) 560

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