G2=g1*2
g3=g1*2²
196=x*4
/4 /4
49
Let "x" be a substitute for "a number"
1/3(x)=x-12 Multiply by 3
x=3x-36 Get n onto the same side of the equation
2x=36 Divide by 2
x=18
That's your answer.
10 years. Bill is 25, his sister is 5, and their mother is 60.
