Question

Fifteen years from now Ravis age will be four times his present age. What is the present age of Ravi

Answer 1

Answer:

Present age of ravi is 5 yrs

Step-by-step explanation:

Let x be the present age of Ravi

x+15=4x

3x=15

x=5

Answer 2

Answer:

Ravi is 5 years old.

Step-by-step explanation:

Let Ravi's present age be 'x'

According to the Question,

15 years from present, he will be 4 times his present age.

Hence the equation will be

x + 15 = 4x

On transposing we get,

x - 4x = -15

-3x = -15

3x = 15

$\sf x = \dfrac{15}{3}$

x = 5.

Hence, Ravi's Present age is 5.

Cross Checking.

[Exclusive of the answer]

If you're not sure with yor answer, there is way to check it. Substitute the value of 'x' in the equation we have formed. If the answer is correct, we will get LHS to be equal to RHS.

x + 15 = 4x

We've got 'x' answer as '5'. Substitute 5 in places of 'x'.

5 + 15 = 4[5]

20 = 20

LHS = RHS

Hence the answer is correct.

NOTE: The cross checking part of the answer is not required while writing the answer, its just to check if the answer is correct.