Quantity I: The price of rice is decreased by 30%, by how much % the consumption is increase so that the expenditure will decreased by 10%?

I. 4x²+ 25x + 36 =0

II. 2y²+ 5y + 3 = 0

I.  2^(x+2)+ 2^(-x)=5

II.  (1/(y+1)+ 1/(y+5))=(1/(y+2)+  1/(y+4))

I. 56x² - 99x + 40 = 0

II. 8y² - 30y + 25 = 0

I. 8x² - 74x + 165 = 0

II. 15y² - 38y + 24 = 0

I. 2 x ² + x  – 1 = 0                 

II. 2 y ² - 3 y + 1 = 0

I. x² – 18x + 81 = 0

II. y² – 3y - 28 = 0

I. 144x² - 163x - 65 = 0

II. 91y² - 128y -48 = 0

I. 5x + 2y = 31

II. 3x + 7y = 36

I. 5x + y = 37

II. 4y+ x = 15