Question

A bit help please. I don't understand this

Answer 1

Blue tube+red tube =25
If red tube is x then blue tube is x+7
X+x+7=25
2x=25-7=18
X=9
Red tube is 9rs and blue tube is 16

Answer 2

Answer is
Red paint = £ 9
Blue paint = £16

Let redpaint be = £x

Therefore blue paint = € x+7
So
X + x +7=25
2x = 25 - 7
2x = 18
X = 9

So x+ 7
9 +7= 16