Answers

2014-06-12T21:36:15+08:00
He ratio of the teachers to the students to the students is 1:40 how many,
 teacher are need to handle 1,280 students?

let x be the number of teachers

by ratio and proportion:

 \frac{1}{40} = \frac{x}{1280}

40x=1280

x=32  teachers
0
2014-06-13T00:44:42+08:00
32 teachers are needed to handle 1,280 students.

Shortcut:

1:40
x:1,280
1,280/40 = 32
0