PSLE Vaidev had a total of 252 coins in his coin box.
47 of all the coins saved were one-dollar coins. There were 3 times as many one-dollar coins as fifty-cent coins. The remaining coins were twenty-cent coins. What was the total value of all the coins in his coin box?
|
One-dollar |
Fifty-cent |
Twenty-cent |
Total |
Comparison between the number of 3 types of coins |
4x3 12 u |
3x3 9 u |
7x3 21 u
|
Comparison between the number of one-dollar and fifty-cent coins |
3x4 |
1x4 |
|
|
Number |
12 u |
4 u |
5 u |
21 u |
Value |
1 |
0.5 |
0.2 |
|
Number x value |
12 u |
2 u |
1 u |
15 u |
Number of $1 coins is the repeated identity.
Make the number of $1 coins the same.
LCM of 4 and 3 = 12
Total number of coins = 21 u
21 u = 252
1 u = 252 ÷ 21 = 12
Total value of coins
= 12 u 2 u 1 u
= 15 u
= 15 x 12
= $180
Answer(s): $180