Total students = 60

Number of boys =

Number of girls = 60 – 36 = 24

25% of the girls come to school by bicycle.

⇒ There are 75% girls who don’t come cycling to school.

⇒ Hence, Number of girls who don’t come cycling to school =

Let the efficiency of A, B and C are 2x,5x and 7x units per day respectively.

(A+B+C)’s efficiency together

=  = 14 units per day

They can complete a work in 10 days.

Then, total work =  units

A complete 30% of that work alone.

So, work done by A =

= units

Time taken by A =

The rate of interest which is charged

Hence, the net value after three years

Detailed Solution:

Interest of 1 year = 10% of Rs.2,00,000 = Rs.20,000
Tax on Interest = 20% of Rs.20,000 = Rs.4,000
So, Amount after tax deduction = 2,00,000 + 20,000 − 4,000
= Rs.2,16,000

Again Interest of 1 year = 10% of Rs.2,16,000 = Rs.21,600
Tax on Interest = 20% of Rs.21,600 = Rs.4,320
So, Amount after tax deduction = 2,16,000 + 21,600 − 4,320
= Rs.2,33,280

Again Interest of 1 year = 10% of Rs.2,33,280 = Rs.23,328
Tax on Interest = 20% of Rs.23,328 = Rs.4665.60
So, Amount after tax deduction = 2,33,280 + 23,328 − 4,665.60
= Rs.2,51,942.40

Thus, the amount will become Rs.2,51,942.40 after 3 years.

Three persons A, B and C can complete one round of circular track in 8, 15 and 20 minutes respectively.

In such questions we will first evaluate LCM of in 8, 15 and 20 minutes.

LCM of (8,15,20) = 120

Hence, we can say that they be together again at the starting point after 120 minutes.

⇒ 120 minutes = 2 hours

Hence, if they start together at 8 A.M from a certain point, they will be together again at the starting point at 10 A.M.

Length to be crossed meters

Relative speed  km/h  m/s

Time  second

Given That,

Total money =Rs. 15000

P : Q =2 : 1

Q :R = 4 : 3

By making Q equal,

P : Q = 2×4 : 1×4

P : Q = 8 : 4

So,

P=8x

Q=4x

R=3x

Total money=15000

P+Q+R=15000

8x+4x+3x=15000

15x=15000

x=1000

Q got 4×1000= Rs. 4000

Therefore, option D is the right answer.

Time taken by 36 men and 48 women  to complete a task = 1 day

Time taken by 6 Men  and 12 women  to complete the task = 5 days

⇒ (36 M + 48 W ) = 5 ( 6M + 12 W )

⇒ (36 M + 48 W ) = 30M + 60 W

⇒ M/W = 2/1

Total work = 5 [6(2) +12(1)]

                      = 120

Total work = number of Person × Number of days

120 =  Number of Person × 8

Number of women required to do the same work = 15  

A train travelling at the speed of x km/h crossed a 300 m long platform in 30 seconds.

Let length of train = L meters

We know that , Distance = Speed× Time

_{.………………………..(1)}

Also, train overtook a man walking in the same direction at 6 km/h in 20 seconds.

_{.…………………..(2)}

_{From (1) and (2)}

_{x = 96}