# Mathematics Quiz For RRB NTPC : 20th December

Q1. A work is being completed by a group of 10 men in 12 days. Same work is completed by a group of 10 women in 6 days. In how many days will the work be completed in both the groups work together?
(a) 4
(b) 6
(c) 9
(d) 18

Q2. A is thrice efficient than B and takes 60 days less than B to complete a work. In how many days can they complete this work if they work together?
(a) 20 days
(b)
(c) 25 days
(d) 30 days

Q3.A man sitting in a running train can count 22 telephone poles in 1 minute. If the poles are 50 meters apart then what is the speed of the train?
(a) 57 km/h
(b) 60 km/h
(c) 63 km/h
(d) 55 km/h

Q4. The average of 8 readings is 24.3 out of which the average of first two is 18.5 and that of next three is 21.2. If the sixth reading is 3 less than seventh and 4 more than eight. What is the sixth reading?
(a) 31.6
(b) 30.6
(c) 32.6
(d) 34.2

Q5. A person takes 3 hours 45 minutes to row his boat 15 km downstream in a river and in opposite direction it takes 2 hours 30 minutes to row 5 km. What will be the speed of the stream?
(a) 0.5 km/h
(b) 2 km/h
(c) 1 km/h
(d) 3 km/h

Q6. A person rows his boat 750 meters upstream in 675 seconds and returns in minutes. What will be his speed in still water?
(a) 3 km/h
(b) 4 km/h
(c) 5 km/h
(d) 6 km/h

Q7. If 10% of m is equal to 20% of n then m:n will be equal to
(a) 2 : 1
(b) 1 : 2
(c) 1 : 10
(d) 1 : 20

Q8. The sum of 5% of one number and 4% of the another number is 2/3 of the sum of 6% of the first number and 8% of the second number. The ratio of the first and the second number is
(a) 2 : 3
(b) 3 : 2
(c) 3 : 4
(d) 4 : 3

Q9. There is 250 liters of kerosene oil in a drum. 5% oil leaks out. What percent of oil is left in the drum?
(a) 95
(b) 105
(c)
(d)

Q10. One fourth of one third of two fifth of a number is 15. What will be 40% of that number?
(a) 160
(b) 200
(c) 225
(d) 180

Solutions:

S1.Ans. (a)
Sol.10 M×12=10 W×6
2M=1W

So, (10M+10W) x days=10 W×6
15W × days=10 W×6
Days=4

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