#4
a) 5:1/3 and 1:x
5/ 1/3= 1/x
5x = 1/3
x = 1/3 /5 =1/3 x 1/5 =1/15
x = 1/15 cup of flour to make one roll
b) 3 dozen = 36 1:1/15 and 36:x
1/ 1/15 = 36/x
x =36 x 1/15 = 12/5 = 2 2/5
x = 2 2/5 cups of flour
c) 1:1/15 and x:5 2/3 5 2/3= 17/3
1/ 1/15 = x/ 17/3
1/15x = 17/3
x =17/3 / 1/15
x =17/3 x 15
x =17 x 5
x = 85 rolls
