Question

The ratio of Chris an iood Dom's ages is

3:4
In 7 years time this ratio will be 4:5
How old is Dom?
(INCORRECT ANSWERS WILL BE REPORTED)nk9iol8.h7g​

Answer 1

28 years

Step-by-step explanation:

Let's represent present age of Chris and Dom as C and D respectively. Then since ratio of present age of Chris and Dom is 3:4. Therefore,

`(C)/(D)=(3)/(4)`

`C=(3)/(4)D` ...(1)

Now, it is given that in 7 years their age ratio will become 4:5. Therefore,

`(C+7)/(D+7)=(4)/(5)`

`5C+35=4D+28\\`

Using value of C from equation(1),

`5*(3)/(4)D-4D=28-35`

`15D-16D=-28\\-D=-28\\ D=28`

Thus, present age of Dom is 28 years.