The length of the base of a triangle is twice its height. if the area of the triangle is 225 square kilometers, find the height

Let
x> length of the base
y> height

we know that
[the area of triangle]=[length of the base]*[height]/2
x=2y
A=225 km²
225=x*y/2> 225=(2y)*y/2> y²=225> y=15 km
x=2y> x=2*15> x=30 km

the answer is
the height is 15 km

Y= (2x) /5 - 6step by step(2x)/5 - y = 6- y = -2/5 (x - 15)answer: || y = (2( x - 15 )) /5