Question

Bill bought cards to celebrate his birthday. He sends 10% of his cards to friend. He sent 15 cards to friend. How many cards did he buy altogether?
A) 1.5
B) 15
C) 6
D) 150​

Answer 1

Answer:

D) 150

Step-by-step explanation:

Given:

• Bill bought cards to celebrate his birthday.
• He sends 10% of his cards to friend.
• He sent 15 cards to friend.

To find:

• How many cards did he buy altogether?

Solution:

First we will assume that the number of cards he buy altogether as x. Then we know that he sends 10% of his cards to friend, which means he 10% of x ( it is nothing but 10 times/multiplied by x ). First you will convert to the percentage form of 10 into its simple decimal form and then we will multipy it by x. After that he sent 15 cards to friend, so it is equal to 15. Thus forming an adequate equation and doing the required calculations, we can easily find out the value of x that is the number of cards he buy altogether.

Let's find out...

According to the problem,

• 10% of x = 15
• 10/100 × x = 15
• 1/10 × x = 15
• x = 15 × 10
• x = 150

∴ The number of cards he buy altogether = 150

____________________________