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Answer:
80 sweets
Step-by-step explanation:
In ratio units, Malachy gets 4-3 = 1 more than Fiona. The total number of ratio units is 4+3+3 = 10, which is 10 times that difference. This means the total number of sweets must be 10 times the difference of 8 sweets between what Malachy got and what Fiona got.
There are 8×10 = 80 sweets altogether.
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Additional comment
Since each ratio unit stands for 8 sweets, we know the distribution is ...
for a total of 32+24+24 = 80.