Answer:
The greatest denomination of stamps she must buy to mail the three parcels is the HCF of 20, 28 and 36. Prime factorization of 20, 28 and 36.
2 20 2 10 5 5 1
2 28 2 14 7 7 1
\[20=2\times 2\times 5\] \[28=2\times 2\times 7\] \[36=2\times 2\times 3\times 3\] \[\therefore \] HCF \[=2\times 2=4\] 2 36 2 18 3 9 3 3 1
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