Question
There are a total of 180 pieces of 5-cent coins, 10-cent coins and 20-cent coins in David's piggy bank. 23 of these coins are 5-cent coins. The number of 20-cent coins is four times the number of 10-cent coins.
  1. How many 20-cent coins are there?
  2. What is the total value of the 20-cent coins in David's piggy bank?
4 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

There are a total of 180 pieces of 5-cent coins, 10-cent coins and 20-cent coins in David's piggy bank. 23 of these coins are 5-cent coins. The number of 20-cent coins is four times the number of 10-cent coins.
  1. How many 20-cent coins are there?
  2. What is the total value of the 20-cent coins in David's piggy bank?