Question

Rohit bought 12 registers for Rs.156.Find the cost of 7 such registers.​

Answer 1

Explanation:

Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture. Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances. Rust consists of hydrated iron(III) oxides Fe2O3.

Answer 2

Let the cost of 7 registers be Rs.x

Register. 12 7

Cost ( in Rs. ) 156 x

If he buys less number of registers, the cost will also be less.

∴ It is a direct variation.

$⇒12:7=156:x$

$⇒ \frac{12}{7} = \frac{156}{x}$

$⇒x= \frac{156×7}{12}$

$⇒x=Rs.91$

∴ The cost of 7 such registers will be Rs.91.