Yes
for a square
P=4s
s=legnth o side
since all sides are equal
20=4s
divide 4
5=s
each sie is 5 units
My thinking is that 10 times 4 equals 40 so 10 of 4 parfaits were made
N+16 is the correct answer to yhr 120+88=nx13
9 / 15
9 / 3 = 3
15 / 3 = 5
so 3 / 5
60/100
6/10