A choir teacher is dividing 6 sopranos and 20 altos into singing groups. He wants each group to have the same combination of sopranos and altos, with no singers left over. What is the greatest number of groups he can make?

GCF (Greatest Common Factor)

6: 1,2,3,6
20: 1,2,4,5,10,20

2 is the greatest number in both, therefore there can only be 2 groups of 3 sopranos, and 10 altos.

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's

Ithink the answer is $2.10