# Important Maths Questions with Solution for SSC CGL and CHSL: 31st Jan 2020

Maths Questions with Solution
Que. 1 the sum of three consecutive number is 93. The greatest among these three numbers is
a.         27
b.        28
c.         30
d.        32
Let the three number are x, x+1, and x+2
Then x+(x+1)+(x+2) = 93
3x = 90
x = 30
greater number is = (x+2) =32

Que. 2 The sum of the ages of 4 children born at the interval of 3 year each is 42 years. What is the age of the youngest child?
a.         4 years
b.        6 years
c.         9 years
d.        10 years
Let the age of the youngest child is x years. So the age of other child will be (x+3) ,  (x+6) and (x+9)
x+ (x+3) +(x+6) + ( x+9 ) = 42
4x = 42-18
x = 6
so the age of the youngest child is = 6 years
Que.3  A train moves with the speed of 180 km/hr. find the speed in m/sec?
a.         20 m/sec
b.        30 m/sec
c.         50 m/sec
d.        70 m/sec
180km/hr = 180 X (5/18) = 50 m/sec
Que .4  A can do a work in 4 days and B can do the work in 3 days. How long it will take if both A and B do the work together?
a.         1 days
b.        1 days 5/7 hours
c.         2 days 3 hours
d.        3 days
A’s 1 day work = 1/4 and B’s 1 day’s work = 1/3
So (A + B )’s 1 day’s work = ( 1/4  + 1/3 ) = 7/12
So A and B will finish the work in 12/7 = 1 days and 5/7 hours.
Que . 5 Average age of 6 boys is 12 years. The average age of 4 other boys is 18 years. Find the average age of all 10 boys.
a.         12 years
b.        14.4 years
c.         15.16 years
d.        13 years