Mathematics Quiz For RRB NTPC : 10th February For Ratio & Proportion

Q1. The ratio of Manish’s salary to Amit’s salary is 3 : 7 . The ratio of Payal’s salary to Amit’s salary is 2 : 5. If total income of all the three is 12000. Then the difference between the salary of Manish & Amit is ?
(a) 3150
(b) 3750
(c) 3850
(d) 3350

Q2. The sum of the present ages of Dharmendra and Amitabh is 65 years. Ten years ago their ages were in the ratio 7 : 2. What will be the ratio of their ages 12 years hence?

Q3. Out of 3750 villagers in a village, the ratio of number of adults and number of minors is 7 : 3 . Find the number of girl children, if the ratio of minor boys to minor girls is 10: 5?
(a) 365
(b) 315
(c) 375
(d) 345

Q4. A box contains 50p, 25p & 10p coins in the ratio 2 : 4 : 5 , amounting to 220 Rs. Find the total number of coins of 50p & 25p ?
(a) 516
(b) 517
(c) 528
(d) 520

Q5.

Q6. The number of male politician to the number of female politician in parliament is 7 : 8 . If percentage increase in the number of male politician and number of female politician be 20% and 10% respectively, what will be the new ratio?

Q7. Ratio of income of Amar and Akbar is 4:7. If income of Amar increases by 50% and those of Akbar decreases by 25%, the new income ratio incomes 8 : 7. What is the income of Amar ?
(a) Rs. 21000
(b) Rs 26000
(c) Rs 23000
(d) Data Inadequate

Q8. If Rs 565 is divided into three parts, proportional to then the second part is?
(a) 215
(b) 205
(c) 225
(d) 235

Q9. If A : B = 2 : 3, B : C = 4 : 5, C : D = 6 : 7. Find A : B : C : D.
(a) 14 : 24 : 30 : 29
(b) 15 : 24 : 30 : 31
(c) 10 : 24 : 20 : 35
(d) 16 : 24 : 30 : 35

Q10. In a mixture of two types of oils O₁ & O₂ the ratio O₁ : O₂ is 3 : 2. If the cost of oil O₁ is Rs. 4/L and that of oil O₂ is Rs. 9/L. Then find the cost of Resulting mixture
(a) Rs. 5
(b) Rs. 6
(c) Rs. 7
(d) Rs. 9

Solutions: