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The GCF is 10.
3 is the hcf
HCF = 15
The GCF/HCF of 16 and 80 is 16.
.75*80=60. it is basically 3 quarters of 80 e.g 25% is 1 quarter 50% is 2 quarters or 1 half 75%is 3 quarters and 100 % is 80 the full number!!! so your answer is 60 :)