Now Rony is 16 years old
Sister is 16 / 4 = 4 years old
After x years Rony will be 16 + x
yeras old
Sister will be 4 + x years old
Now you must solve equation :
( 16 + x ) / ( 4 + x ) = 2 Multiply both sides by 4 + x
16 + x = 2 ( 4 + x )
16 + x = 8 + 2 x Subtract 8 to both sides
16 + x - 8 = 8 + 2 x - 8
8 + x = 2 x Subtract x to both sides
8 + x - x = 2 x - x
8 = x
x = 8
After 8 years Ronny will be 16 + 8 = 24 years old
Sister will be 4 + 8 = 12 years old
24 / 12 = 2
Rony, who is sixteen years old, is four times as old as his sister. How old will Rony be when he is twice as old as his sister?
1 answer