By cross multiplication(9x - 7)(x + 6) = (3x - 4)(3x + 5)⇒ 9x2 + 54x - 7x - 42 = 9x2 + 15x - 12x - 20⇒ 9x2 - 9x2 + 47x - 3x = - 20 + 42⇒ 44x = 22⇒

Q27 of 90 Page 107

Solve:

By cross multiplication

(9x - 7)(x + 6) = (3x - 4)(3x + 5)

⇒ 9x² + 54x - 7x - 42 = 9x² + 15x - 12x - 20

⇒ 9x² - 9x² + 47x - 3x = - 20 + 42

⇒ 44x = 22

⇒

Solve:

Two numbers are in the ratio 8:3. If the sum of the numbers is 143, find the numbers.