The sum of ages of Andrew and Alfred is 25. In five years time the age of Alfred will be twice the age of Andrew now How old is Andrew
How old is Alfred​

= 20

Step-by-step explanation:

Using pythagoras theorem

hypotenuse² = opposite² + adjacent²

hypotenuse - longest side of the triangle orthe side where the right angle faces

opposite - the side of the triangle in which the given angle faces

adjacent - the other side of the triangle which isn't the opposite or hypotenuse

hyp² = 12² + 16²

hyp² = 144 + 256

hyp² = 400

hyp = √400

hyp =  20