Question

An old 500-page manuscript must be copied. If copying the entire manuscript takes one person 40 days, how many days would 4 people take?

• A. 10
• B. 20
• C. 25
• D. 160

Answer 1

The correct option is A 10

If more people help in copying the manuscript, fewer days will be required. That is, the number of days and number of people are in inverse proportion.

Let us assume that 4 people need $x$ days.
$4x=40\times 1$
$x=\frac{40}{4}$
$x=10$
$\therefore$ 4 people require 10 days.