Question

Rayan's age after 15 years will be 5 times his age 5 years back. What is Rayan's present age?

a ) 50 years
b ) 10 years
c ) 15 years
d ) 5 years

please answer it urgent ​

Answer 1

Answer:

50 years..................

Answer 2

Step-by-step explanation:

R={10 years old}

PREMISES

R+15=5(R-5)

ASSUMPTIONS

Let Rayan's present age=R

Let Rayan's age after 15 years=R+15

Let Rayan's age 5 years back=R-5

CALCULATIONS

R+15=5(R-5)

R+15=5R-25

(R-R)+15=(5R-R)-25

0+15=4R-25 (Flip the equation)

4R-25=15

4R-(25–25)=15+25

4R-0=15+25

4R=15+25

4R=40

4R/4=40/4

R=40/4

R=

10 years old

PROOF

If R=10 years old, then the inverse of the statement R+15=5(R-5) returns

R+15/(R-5)=5

(10+15)/(10–5)=5

25/5=5 and

5=5 proves the root (zero) R=10 years old of the statement R+15=5(R-5)

C.H.