Anokye has some shirts, three of them are white and one of them are blue and half of the remaining are 3/10 of all his shirts?
I will assume that your question will ask
"How many shirts does he have ? "
number of shirts ---- x , where x is a whole number
(1/2)(x - 4) = (3/10)x
times 10
5(x-4) = 3x
5x - 20 = 3x
2x = 20
x = 10