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A bank had 340 pieces of 4-gram and 10-gram gold coins in the morning.
During the day, it sold `1/2` of the 10-gram gold coins and `3/5` of the 4-gram gold coins to some customers.
By the end of the day, the bank was left with 3 times as many 10-gram gold coins as 4-gram gold coins.
(a) How many $10-gram gold coins did the bank sell?
(b) How many coins were sold in all?
(c) What is the mass of all the coins that were left unsold?
Notes to student:
- If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12