31)

A. B and C are three positive numbers such that the average of three-fifth of A and 30% of B is 13.5, and the average of \(\frac{3}{8}\) times of B and 25% of C is 15. If A is equal to \(\frac{5}{12}\) times of C, then the sum of all three numbers A, B and C is:

SSC CHSL 2021

A)

120

B)

145

C)

135

D)

125

32)

The average age of 35 persons is 40 years. 5 new persons with an average age of 35 years joined them. The average age of all the persons is:

SSC CHSL 2021

A)

\(39\frac{7}{8} \) years

B)

\(39\frac{3}{8}\) years

C)

\(39\frac{1}{8}\) years

D)

\(39\frac{5}{8}\) years

33)

Pawan travels from X to Y at the speed of 10 km/h, from Y to Z at 15 km/h and from Z to W at 20 km/h. If XY = YZ = ZW (in km), then the average speed of Pawan for the whole journey is:

SSC CHSL 2021

A)

\(13\frac{9}{13}\) km/h

B)

\(13\frac{10}{13}\) km/h

C)

\(13\frac{8}{13}\) km/h

D)

\(13\frac{11}{13}\) km/h

34)

The average of 40 numbers is 48.2. The average of the first 15 numbers is 45 and that of the next 22 numbers is 50.5. The 38^th number is 1 more than the 39^th number, and the 39^th number is 3 less than the 40^th number. What is the average of the 39^th and 40^th numbers?

SSC CHSL 2021

A)

49

B)

48

C)

48.5

D)

47.5

35)

The average age of 7 members of a family is 35 years. If the youngest members are twins and they are 15 years old, then what was the average age (in years) of the family members at the time of the birth of the twins?

SSC CHSL 2021

A)

25

B)

28

C)

30

D)

27