PSLE Sean saved a total of $236 in coins in his coin box.
59 of all the coins saved were one-dollar coins. There were 4 times as many one-dollar coins as fifty-cent coins. The remaining coins were ten-cent coins. How many coins did Sean save in his coin box altogether?
|
One-dollar |
Fifty-cent |
Ten-cent |
Total |
Comparison between the number of 3 types of coins |
5x4 20 u |
4x4 16 u |
9x4 36 u
|
Comparison between the number of one-dollar and fifty-cent coins |
4x5 |
1x5 |
|
|
Number |
20 u |
5 u |
11 u |
36 u |
Value |
1 |
0.5 |
0.1 |
|
Number x value |
20 u |
2.5 u |
1.1 u |
23.6 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 = 23.6 u
23.6 u = 236
1 u = 236 ÷ 23.6 = 10
Total number of coins
= 20 u + 5 u + 11 u
= 36 u
= 36 x 10
= 360
Answer(s): 360