Question

Riya's brother is 28 years old .he is 4 times old as Riya . so how old is Riya three years ago​

Answer 1

Answer:

Let Riya’s age be x.

Let her mother’s age be y.

Given:

y=4x . . . . . (i)

y+5=3(x+5) . . . . . (ii)

Solution:

Use the relation obtained in (i) and substitute it in eq. (ii).

So, we get

y+5=3(x+5) replaced by

this

4x+5 = 3 (x+5)

⇒ 4x + 5 = 3x + 15 ……………………….(Using the basic algebraic solving rules)

sorting variable to the L.H.S and constants to the R.H.S,

4x - 3x = 15 - 5

⇒ x = 10

∵ y=4x

∴ y = 4 x 10 = 40

∴ y = 40

Conclusion:

Riya is currently 10 years old, while her mother is 40 years old.

Step-by-step explanation:

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Answer 2

Answer:

riya x

brother 4x

4x =28

x=7

ruya age =7

3 year ago =x-3

=7-3

=4

ans age 3 year ago is 4 years