The area of a square is S^2 with S as one side. To find the length of the side, simply work the formula backwards. The square root of 400 is 20. Hope this helps! :)
75 = 5 x 3 x 5
We can solve this using a factor tree.
75
/ \
5 15
/ \
3 5
39/120 = x / 1800....39 choc. chip to 120 students = x choc. chip to 1800 students
now we cross multiply because this is a proportion
(120)(x) = (39)(1800)
120x = 70200
x = 70200/120
x = 585 <===
or u could do it this way as well...
39 out of 120 picked chocolate chip....
39/120 = 0.325 = 32.5%....so 32.5% chose chocolate chip.
32.5% of 1800 = 0.325(1800) = 585 <==
