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# RRB NTPC Mathematics Quiz : 15th November

Q1. What is 30% of 25% of Rs. 1800?
(a) Rs 153
(b) Rs 165
(c) Rs 135
(d) Rs 140

Q2. Two filling pipes A and B can fill a tank in 18h and 24h respectively, while a third pipe C can empty it in 30h when filled. If the tank is empty and all the three pipes are opened together, in how much time will the tank be full?

Q3. Excluding stoppages, the speed of a bus is 84 km/h and including stoppages it in 70 km/h. What is the stoppage time of the bus (in min) per h?
(a) 9min
(b) 15min
(c) 10min
(d) 8min

(a) 865
(b) 727
(c) 527
(d) 531

(a) 12cm
(b) 8.06 cm
(c) 6.5 cm
(d) 7.26cm

Q7. A cylindrical well of depth 6m with internal radius of 1.25m is dug up. The mud, so obtained, is spread evenly to form a platform of dimension 5.1m × 4.2m what is the height of the platform?
(a) 1.225m
(b) 2.355m
(c) 3.658m
(d) 1.375m

Q8. If the price of on article rose by 28% every odd year and fell by 21.875% every even year, then what would be the percentage change after 40 years?
(a) 3.56% increase
(b) 2.56% decrease
(c) 8.62% increase
(d) No change

Q9. The entry fee in an exhibition was Rs 28. Later this was reduced by 25%, which increased the sale of tickets by 40%. Find the percentage increase in the number of visitors.
(a) 86.67%
(b) 83.25%
(c) 92.25%
(d) 89.68%

Q10. At the rate of 18%, the difference between SI and CI compounded annually on Rs 8000 for 2 years will be.
(a) 259.2
(b) 354.4
(c) 365.2
(d) 257.3

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