PSLE Cody saved a total of $264 in coins in his coin box.
57 of all the coins saved were one-dollar coins. There were 4 times as many one-dollar coins as ten-cent coins. The remaining coins were fifty-cent coins. How many coins did Cody save in his coin box altogether?
|
One-dollar |
Ten-cent |
Fifty-cent |
Total |
Comparison between the number of 3 types of coins |
5x4 20 u |
2x4 8 u |
7x4 28 u
|
Comparison between the number of one-dollar and ten-cent coins |
4x5 |
1x5 |
|
|
Number |
20 u |
5 u |
3 u |
28 u |
Value |
1 |
0.1 |
0.5 |
|
Number x value |
20 u |
0.5 u |
1.5 u |
22 u |
Number of $1 coins is the repeated identity.
Make the number of $1 coins the same.
LCM of 5 and 4 = 20
Total value of coins = 22 u
22 u = 264
1 u = 264 ÷ 22 = 12
Total number of coins
= 20 u + 5 u + 3 u
= 28 u
= 28 x 12
= 336
Answer(s): 336