Question

Sister's age is 3 times that of her brother's After 5 years the sister shall be twice as old as her brother How many years before the sister's age was 6 times of her brother's age.​

Answer 1

Answer:

LET THE SISTERS AGE BE X

AND TAT OF BROTHER BE Y

X=3Y....(1)

X+5=2(Y+5)      -----  X+5=2Y+10

3Y-2Y=5

Y=5 (PRESENT AGE OF BROTHER)

X=3*5=15 (PRESENT AGE OF SISTER)

ACC TO QUES

LET THE YEAR BEFORE BE A

15-A=6(5-A)

15-A=30-6A

-A+6A=15

5A=15

ANS     YEARS=AFTER 3 YEARS....

Step-by-step explanation: