# Mathematics Quiz For RRB NTPC : 17th December

Q1.Two taps can fill a tank respectively in 20 and 30 min. When the tank was empty both the taps were opened and after some time first tap was closed. It took 18 min to fill the tank. After how much time of the beginning the first tap was closed ?
(a) 5 min
(b) 8 min
(c) 10 min
(d) 12 min

Q2.A train 150 metres long crosses a milestone in 15 seconds and crosses another train of the same length travelling in the opposite direction in 12 seconds. The speed of the seconds train in km/hr is
(a) 52
(b) 56
(c) 54
(d) 58

Q3.A person can row a distance of one km upstream in ten minutes and downstream in four minutes. What is the speed of the stream ?
(a) 4.5 km/h
(b) 4 km/h
(c) 9 km/h
(d) 5.6 km/h

Q4.If 60 subtracted from 60% of a number the remainder is 60, then what is the number ?
(a) 120
(b) 150
(c) 180
(d) 200

Q5.A ball bounces from a hard floor after falling from 10 meter of height. During collision its energy reduces by 20%. Up to what height it will bounce now ?
(a) 2 m.
(b) 8 m.
(c) 4 m.
(d) 6 m.

Q6.In what ratio mixture of 30% concentration of alcohol and 50% concentration of alcohol are to be added so that the resultant mixture will be 35% concentration of alcohol ?
(a) 2 : 1
(b) 3 : 1
(c) 3 : 3.5
(d) 3 : 5

Q7.In a college, 40% of the students were allotted group A, 75% of the remaining were given group B and the remaining 12 students were given group C. Then the number of students who applied for the groups is
(a) 100
(b) 60
(c) 80
(d) 92

Q8.A trader sold an item at a loss of 20%. Had he sold it for Rs. 100 more, he would have gained a profit of 5%. What is the cost price of the item ?
(a) Rs. 200
(b) Rs. 25
(c) Rs. 400
(d) Rs. 250

Q9.An item is sold for Rs. 178 at 11% loss. What should be the selling price (in rupees) to get a profit of 11% ?
(a) 222.50
(b) 267
(c) 222
(d) 220

Q10.A dishonest dealer professes to sell his goods at the cost price but uses a false weight of 850g instead of 1 kg. His gain percent is

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