# Mathematics Quiz For RRB NTPC : 12th December

Q1. Of the three numbers, the ratio of the first and the second is 8 : 9 and that of the second and third is 3 : 4. If the product of the first and third number is 2400, then the second number is
(a) 45
(b) 40
(c) 30
(d) 35

Q2. A boat is rowed downstream at 15.5 km/h and upstream at 8.5 km/h the speed of the stream is
(a) 3.5 km/h
(b) 5.75 km/h
(c) 6.5 km/h
(d) 7 km/h

Q3. The price of a Maruti car rises by 30% while the sales of the car comes down by 20%. What is the percentage change in the Total revenue ?
(a) – 4%
(b) – 2%
(c) + 4%
(d) + 2%

Q4. Zinc and copper are in the ratio 5 : 3 in 400 g of an alloy. How much of copper (in g) should be added to make the ratio 5 : 4?
(a) 72
(b) 200
(c) 50
(d) 66

Q5. If 1/3 A=1/4 B=1/5 C then what is (A + B)/(A + B + C) = ?
(a) 3/4
(b) 7/12
(c) 5/7
(d) 5/12

Q7. Sum of three consecutive integers is 51. The middle one is?
(a) 14
(b) 15
(c) 16
(d) 17

(a) 998999
(b) 999899
(c) 989999
(d) 999989

Q9. Factorize x² + 3x ­ 18
(a) (x+18)(x­1)
(b) (x­1)(x+18)
(c) (x+6)(x­3)
(d) (x­6)(x+3)

Q10. If sum of the roots of a quadratic equation is –7 and product of the roots is 12. Find the quadratic equation.
(a) x² + 7x + 12 = 0
(b) x² – 7x + 12 = 0
(c) x² – 7x – 12 = 0
(d) x² + 7x – 12 = 0

Solutions:

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