Mathematics Quiz For RRB NTPC : 21st January 2020 for Number system, profit & loss and Simple interest

Table of Contents

Q1. Given: 2x – 4 ≤ 2 – x/3 and 2(2x + 5) > 3x – 5, then x can take which of the following values?
(a) -14
(b) 3
(c) 4
(d) 14

Q2. A painter can paint a fence in 24 hours. After 6 hours he takes a break. What fraction of the fence is yet to be painted?
(a) 0.6
(b) 0.2
(c) 0.75
(d) 0.8

Q3. If 1/6 of x – 7/2 of 3/7 equals – 7/4, then the value of x is
(a) -1.5
(b) 3
(c) -2.5
(d) 6

Q4. x and y are two numbers such that their mean proportion is 9 and third proportion is 243. What is the value of x and y?
(a) 3 and 9
(b) 3 and 27
(c) 6 and 27
(d) 6 and 81

Q5. If 21% of an electricity bill is discounted, Rs 1817 is still to be paid. How much was the original bill amount?
(a) Rs 1502
(b) Rs 2336
(c) Rs 2300
(d) Rs 1538

Q6. The average revenues of 7 consecutive years of a company is Rs 79 lakhs. If the average of first 4 years is Rs 74 lakhs and that of last 4 years is Rs 86 lakhs, what is the revenue for the 4th year?
(a) Rs 87 lakhs
(b) Rs 89 lakhs
(c) Rs 85 lakhs
(d) Rs 83 lakhs

Q7. A shopkeeper, sold dried apricots at the rate Rs 1210 a kg and bears a loss of 12%. Now if he decides to sell it at Rs 1331 per kg, what will be the result?
(a) 6.4 percent loss
(b) 3.2 percent gain
(c) 6.4 percent gain
(d) 3.2 percent loss

Q8. If the shopkeeper sells an item at Rs 1600 which is marked as Rs 2000, then what is the discount he is offering?
(a) 25 percent
(b) 20 percent
(c) 30 percent
(d) 10 percent

Q9. If cosecA + cotA = x, then value of x is
(a) 1/(cosecA – cotA)
(b) 1/(secA – tanA)
(c) 1/(secA – cosA)
(d) 1/(sinA – cosA)

Q10. Dalajit lent Rs 10800 to Jaabir for 3 years and Rs 7500 to Kabir for 2 years on simple interest at the same rate of interest and received Rs 1422 in all from both of them as interest. The rate of interest per annum is
(a) 3.5 percent
(b) 4 percent
(c) 3 percent
(d) 4.5 percent