Aline segment 42 inches long is divided into 3 portions in a ratio of 1: 2: 4.
how many inches long is the longest portion than the shortest portion?

a) 16 b) 18 c) 20 d) 22 e) none of these

Option B.

Step-by-step explanation:

It is given that A line segment 42 inches long is divided into 3 portions in a ratio of 1:2:4.

Let the length of 3 portions are x,2x and 4x respectively.

Divide both sides by 7.

The value of x is 6.

The lenght of 3 portions are  

Difference between the longest portion and the shortest portion is

Longest portion is 18 inches longer than the shortest portion

Therefore, the correct option is B.

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0