Question
PSLE
Ben saved a total of $21 in coins in his coin box. 12 of all the coins saved were one-dollar coins. There were 3 times as many one-dollar coins as ten-cent coins. The remaining coins were twenty-cent coins. How many coins did Ben save in his coin box altogether?
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PSLE
Ben saved a total of $21 in coins in his coin box. 12 of all the coins saved were one-dollar coins. There were 3 times as many one-dollar coins as ten-cent coins. The remaining coins were twenty-cent coins. How many coins did Ben save in his coin box altogether?