type 7 finding sum difference product based ratio & proportion problems Section-Wise Topic Notes With Detailed Explanation And Example Questions

Question : 1

What must be added to each term of the ratio 7 : 11, so as to make it equal to 3 : 4 ?

a) 6.5

b) 5

c) 7.5

d) 8

Question : 2

The ratio of the number of boys and girls of a school with 504 students is 13 : 11. What will be the new ratio if 12 more girls are admitted?

a) 9 : 10

b) 10 : 9

c) 81 : 91

d) 91 : 81

Question : 3

If there is a reduction in the number of workers in a factory in the ratio 15 : 11 and an increment in their wage in the ratio 22 : 25, then the ratio by which the total wage of the workers should be decreased is

a) 3 : 7

b) 3 :5

c) 5 : 6

d) 6 : 5

Question : 4

Three numbers are in the ratio 1 : 2 : 3. By adding 5 to each of them, the new numbers are in the ratio 2 : 3 : 4. The numbers are:

a) 1, 2, 3

b) 5, 10, 15

c) 15, 30, 45

d) 10, 20, 30

Question : 5

The ratio of the number of ladies to that of gents at a party was 3 : 2. When 20 more gents joined the party, the ratio was reversed. The number of ladies present at the party was

a) 24

b) 16

c) 32

d) 36

Question : 6

The total number of students in a school was 660. The ratio between boys and girls was 13 : 9. After some days, 30 girls joined the school and some boys left the school and new ratio between boys and girls became 6 : 5. The number of boys who left the school is :

a) 30

b) 60

c) 40

d) 50