ratio and proportions and percentage

Which of the following is greatest?

• 7:15

• 15:23

• 17:25

• 21:29

The average age of 3 boys is 25yrs and their ages are in the proportion 3:5:7. The age of the youngest boy is :

• 21yrs

• 18yrs

• 15yrs

• 9yrs

In a school 10% of the boys are same in number as 1/4 th of the girls. What is the ratio of the boys to girls in the school?

• 3:2

• 5:2

• 2:1

• 4:3

The compounded ratio of(2:3), (6:11), and (11:2) is

• 1:2

• 2:1

• 11:24

• 36:121

If 10% of x=20% of y, then x:y is equal to :

• 1:2

• 2:1

• 5:1

• 10:1

In a school, the ratio of number of boys to girls is 8:5, and if there are 160 girls, then the total no.of students in the school is

• 100

• 250

• 260

• 416

The speed of 3 cars are in the ratio 5:4:6, then the ratio between the time taken by them to travel the same distance is

• 5:4:6

• 6:4:5

• 10:12:15

• 12:15:10

A sum of money is distributed among the a,b,c,d in the proportion 5:2:4:3. If c gets 1000rs more than d, then b's share is?

• 500rs

• 1500rs

• 2000rs

• none

1/5:1/x=1/x:1/125, then the value of x is?

• 1.5

• 2

• 2.5

• 3.5

if a:b=8:15, b:c=5:8, c:d=4:5 then a:d is equal to ?

• 2:7

• 4:15

• 8:15

• 15:4