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  • Question
  • The concentration of petrol in three different mixtures (petrol and kerosene) is 1/2 , 3/5 and 4/5 respectively. If 2 litres, 3 litres and 1 litre are taken from these three different vessels and mixed. what is the ratio of petrol and kerosene in the new mixture?


  • Options
  • A. 4:5
  • B. 3:2
  • C. 3:5
  • D. 2:3

  • Correct Answer
  • 3:2 

    Explanation

    Concentration of petrol in    A        B        C

                                                    1/2      3/5     4/5

    Quantity of petrol taken from A = 1 litre out of 2 litre

    Quantity of petrol taken from B = 1.8litre out of 3 litre

    Quantity of petrol taken from C = 0.8 litre out of 1 litre

    Therefore, total petrol taken out from A, B and C = 1+1.8+0.8 =3.6 litres

    So, the quantity of kerosen =(2+3+1) - 3.6 =2.4 litre

    Thus, the ratio of petrol to kerosene = 3.6/2.4 = 3/2


  • Ratio and Proportion problems


    Search Results


    • 1. In a college, the ratio of the number of boys to girls is 8 : 5. If there are 160 girls, the total number of students in the college is

    • Options
    • A. 100
    • B. 250
    • C. 260
    • D. 416
    • Discuss
    • 2. A dog takes 3 leaps for every 5 leaps of a hare. If one leap of the dog is equal to 3 leaps of the hare, the ratio of the speed of the dog to that of the hare is :

    • Options
    • A. 9:5
    • B. 2:3
    • C. 4:7
    • D. 5:6
    • Discuss
    • 3. The salaries of A, B, and C are in the ratio of 1 : 2 : 3. The salary of B and C together is Rs. 6000. By what percent is the salary of C more than that of A?

    • Options
    • A. 100 %
    • B. 200%
    • C. 300%
    • D. 600%
    • Discuss
    • 4. The third proportional to 9 and 12 is ?

    • Options
    • A. 14
    • B. 16
    • C. 18
    • D. 20
    • Discuss
    • 5. Seats for Mathematics, Physics and Biology in a school are in the ratio 5:7:8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats ?

    • Options
    • A. 1:2:3
    • B. 2:3:4
    • C. 3:4:5
    • D. 4:5:6
    • Discuss
    • 6. Alloy A contains 40% gold and 60% silver. Alloy B contains 35% gold and 40% silver and 25% copper. Alloys A and B are mixed in the ratio of 1:4 .What is the ratio of gold and silver in the newly formed alloy is?

    • Options
    • A. 20% and 30%
    • B. 36% and 44%
    • C. 25% and 35%
    • D. 49% and 36%
    • Discuss
    • 7. The number of oranges in three baskets are in the ratio of 3 : 4 : 5. In which ratio the no. of oranges in first two baskets must be increased so that the new ratio becomes 5 : 4 : 3?

    • Options
    • A. 1:3
    • B. 2:1
    • C. 3:4
    • D. 2:3
    • Discuss
    • 8. What is the third proportional to 16 and 36 ?

    • Options
    • A. 81
    • B. 79
    • C. 84
    • D. 88
    • Discuss
    • 9. Divide Rs.6500 among A, B and C so that after spending 90%, 75% and 60% of their respective saving was in the ratio of 3: 5: 6

    • Options
    • A. A=1000, B=2000, C=1500
    • B. A=3000, B=1000, C=1500
    • C. A=3000, B=2000, C=1500
    • D. A=3000, B=2000, C=1000
    • Discuss
    • 10. The ratio of male and female in a city is 7 : 8 respectively and percentage of children among male and female is 25 and 20 respectively. If number of adult females is 156800, what is the total population of the city?

    • Options
    • A. 4,12,480
    • B. 3,67,500
    • C. 5,44,700
    • D. 2,98,948
    • Discuss


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