Question

I need some help with this question

Answer 1

20cm

Explanation:

First, lets assign variables to the lenghts and widths:

width of blue = a

height of blue = b

width of green = c

height of green = d

Now, express all the provided information into equations

(1) a = 30

(2) c*d = 700

(3) a*b = 0.6 * 700

(4) b = 0.7 * d

Now, start substituting to find d:

Put (1) in (3):

30b = 0.6 * 700 => b = 0.6*700/30 = 14

Put b in (4):

14 = 0.7 * d => d= 14/0.7 = 20

So the height of the green rectangle is 20 cm.