Question

40 bags of cotton cost Rs. 2200, but by exchanging 25 bags to the shopkeeper we get 30 grams of silver. Find the price of 150g of silver by exchanging the relevant number of cotton bags.

• A. Rs 6875
• B. Rs 6675
• C. Rs 6575
• D. Rs 6975

Answer 1

The correct option is A

Rs 6875

In this question, we need to use the direct proportion twice.
First, we need to find the price of 25 bags for exchanging silver. That can be found out by applying direct proportion.
$\frac{2200}{40}=\frac{x}{25}$
x = Rs. 1375
This value of x gives the price of 30 grams of silver.
To find the price of 150 grams of silver, we apply direct proportion again.
$\frac{30}{1375}=\frac{150}{y}$
y = Rs. 6875