Step-by-step explanation:
sofia mother-- 12+2a
sofia-- 2a
after 8years
sofia mother (2a×3) - 20
sofia 2a+8
solution
(2a×3) - 20) + 2a = (12+2a) + (2a+8)
(6a-20) + 2a = 12+2a+2a+8
6a-20+2a = 4a + 20
8a-20= 4a+20
collect like terms
8a-4a= 20+20
4a=40
divide both side by 4
a= 10
present age
sofia mother= 12+2a
12+2(10)
=12+20
= 32
sofia age= 2a
= 2(10)
= 20
Sofia mother present age is 32
sofia present age is 20
