Question

Ten years ago, Rahul is 5 years older than Ravi. Find the present age of Ravi, if it is given that sum of their ages after 5 years will be 43 years.​

Answer 1

Answer:

This is an example of simultaneous equations.

The two equations we can derive from the information given is:

Let Rohit’s age = x and his brother’s = y

Then,

x+y=25 (1)

x=y+5 (2)

To isolate a variable we can do eq.(1) -eq.(2)

So,

(x+y)-x=25-(y+5)

Which simplifies to:

y=25-y-5

y=20-y

2y=20

y=10

We have found y, now we substitute y into any of the equations at the top.

For example, we use eq.(2)

x=y+5

x=(10)+5

x=15

Therefore, Rohit is 15 years old and his brother is 10 years old.

Answer 2

Step-by-step explanation:

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