h e n c e P = 7 Q

P + Q P - Q = 7 Q + Q 7 Q - Q = 8 Q 6 Q = 4 3

$$\begin{gathered} 7 5 x 3 2 14 15 ÷ 525 100 \\ 9 4 ÷ 525 100 \\ 900 2100 \\ = 3 7 \end{gathered}$$

Given equation can be written as

$$\begin{gathered} 21 5 x 10 3 + ? = 24 \\ = > 14 + ? = 24 \\ = > ? = 24 - 14 \\ = > ? = 10 \end{gathered}$$

This can be easily simplified by Approximation process

Given 39.96% of 649.85  ÷13.07 = 45.14 - ? can be written as 

40% of 650  ÷13 = 45 - ?

$$\begin{gathered} 40 x 650 100 13 = 45 - ? \\ ? = 45 - 20 \\ ? = 25 . \end{gathered}$$

x^2+ 30x + 81 = 0
x^2+ 27x + 3x + 81 = 0
x = -3, -27
y^2-9y -162 = 0
y^2-18y + 9y -162 = 0
y = -9, 18
Hence, no relationship can be established between x and y