X = his money
Y = half of his money
X = 2Y & Y = 1/2X
He earned $12 mowing lawn, and that, added to the other half of his money gives $32
As an equation, 32 = Y + 12
So Y = 32 - 12 if we takeaway 12 from both sides.
Therefore, Y = 20 and since X = 2Y, X = 2 x 20 which gives 40
Ken initially had $40
I know the question has been answered already but I thought I’d provide some extra explanations ((:
Take care ;)