#21 A = 117 , W = 9 3/4
9 3/4 = 39/4
A = L W
W = A/L
W = 117 / (39/4)
W = 117 4/39
W = 468/39
W = 12
Answer: width of the rectangle is 12ft
#24
1/2 / (3 1/4)
= 1/2 /(13/4)
=1/2 4/13
=2/13
# 27
(5 1/3) / (8/15)
= 16/3 / 8/15
= 16/3 15/8
= 10
#30
(7 3/4) / (12 1/4)
=31/4 / 49/4
= 31/4 4/49
= 31/49
#33
1/5 / d when d = 6 2/3
6 2/3 = 20/3
so
1/5 / d
= 1/5 / 20/3
= 1/5 3/20
=3/100
#36
d / c when d = 6 2/3 and c = 4/5
6 2/3 = 20/3
so
d/c = 20/3 / 4/5
=20/3 * 5/4
=25/3
=8 1/3
