Showing Mcqs of math -- (543)

The least square number, which is exactly divisible by 10, 12, 15 and 18, is:

360

400

900

1600

 Find the value of x in the following proportion: 27: 72:: x:8 

5

7

3

none of these

 Find a third proportional to the numbers 4, 42.

441

541

641

none of these

The ratio of boys and girls in a school is 9: 5. If the total number of students in the school is 1050, then the number of boys is

785

890

675

790

 When x is added to each term of 7: 13 the ratio becomes 2:3. The value of x is 

7

11

5

none of these

. A mixture contains alcohol and water in the ratio of 12: 5. On adding 14 liters of water, the ratio of alcohol to water becomes 4: 3. The quantity of alcohol in the mixture is 

18 liters

24 liters

26 liters

none of these

If an alloy contains copper and silver in the ratio 3: 7, then the percentage quantity of silver in the alloy is 

90%

70%

60%

50%

If a: b=2: 5, then the value of (2a+3b): (7a + 5b) is

19/39

99/13

31/19

19/31

If 5a+3b/ 2a-3b =23/5 then the value of a: b is 

2:1

1:4

1:2

4:1

 The ratio of the age of a man and his wife is 4: 3. After 4 years this ratio will be 9: 7. If at the time of the marriage, the ratio was 5:3, then how many years ago they were married?

12 years

8 years

10 years

15 years