Amina thinks of a number and subtracts from it. She multiplies the result by 8. The result now obtained is 3 times the same number she thought of. What is the number?
Let the number be x.
(x - 5/2) × 8 = 3x
⇒ 8x - 20 = 3x
⇒ 5x = 20
⇒ x = 4
Thus, the number is 4.
Hasan buys two kinds of cloth materials for school uniforms, shirt material that costs him Rs 50 per metre and trouser material that costs him Rs 90 per metre.
For every 2 meters of the trouser material he buys 3 metres of the shirt material.
He sells the materials at 12% and 10% profit respectively. His total sale is Rs 36,660. How much trouser material did he buy?