Find the number of each type of coin

Learn with an example

🔔 Erica has 6 coins worth ₹24.00. If the coins are all 10-rupee coins and 1-rupee coins, how many 10-rupee coins and 1-rupee coins does she have?

  • 4 10-rupee coins and 2 1-rupee coins
  • 5 10-rupee coins and 1 1-rupee coin
  • 3 10-rupee coins and 3 1-rupee coins
  • 2 10-rupee coins and 4 1-rupee coins

2 10-rupee coins are worth ₹20.00 and 4 1-rupee coins are worth ₹4.00. Together they are worth ₹24.00.

So, Erica has 2 10-rupee coins and 4 1-rupee coins.

🔔 Adriana has the following coins.

If the total value of the coins is ₹11.50, what is the missing coin?

 _____ 10-rupee coins
 _____ 5-rupee coins
_____ 2-rupee coins
 _____1-rupee coins
 ____ 50-paise coins

Find out the value of the coins that you can see.

1 10-rupee coin, worth ₹10.00.
1 50-paise coin, worth ₹0.50.

The coins you can see are worth ₹10.50.

Subtract ₹10.50 from ₹11.50.

₹11.50 − ₹10.50 = ₹1.00

To make ₹1.00, the 1 unknown coin must be:

1 1-rupee coin, worth ₹1.00.

So, the unknown coin must be 1 1-rupee coin.

🔔 Kira has 5 coins, all of which are 10-rupee coins and 5-rupee coins. In all, they’re worth ₹30.00. How many of each kind of coin does Kira have?

 ____ 10-rupee coins
 ____ 5-rupee coins

1 10-rupee coin is worth ₹10.00 and 4 5-rupee coins are worth ₹20.00. Together they are worth ₹30.00.

So, Kira has 1 10-rupee coin and 4 5-rupee coins.

Let’s practice! 🖊️