Question 49764
a/b = c/d [Use the proportion ratio]
27.5 students/1 teacher = x students/42 teachers [Plug-in the values]
(27.5)(42)=(1)(x) [Cross-multiply]
1155 = x [Number of students]
.
Check by plugging all of the values back into the original equation]
1/b = c/d
27.5/1 = 1155/42 [Solve each side of the equation]
27.5 = 27.5 [Checks out]