Question

plzzz solve 8 , 9 th part ​

Answer 1

Answer:

No 8) Answer is 12years

Step-by-step explanation:

Let now your age is X

after 12years it will be X+12

before 4years it was X-4

but we have 3(X-4)=X+12

So, 3X-12=X+12

2X=24

and X=12

So now your age is 12years.

Answer 2

Step-by-step explanation:

$l = b + 6 \\ 2(l + b) = 80 \\ so \: substitute\: the \: value \: of \: l \: \\ b = 17\: and \: l = 23$