You know that to make 20 pancakes you have to use 2 eggs. How many eggs are needed to make 100 pancakes?

1. 10

The correct option is A 10
Given,

Eggs	2	x
Pancakes	20	100

Eggs and pancakes are in direct proportion.

$\frac{egg{s}_1}{pancake{s}_1}=\frac{x}{pancake{s}_2}$
$\frac{2}{20}=\frac{x}{100}$
$\frac{1}{10}\times 100=x$
$10=x$

$\therefore$ We need 10 eggs to make 100 pancakes.