Question

A pancake recipe require 1 2/3 cups of flour to make 20 pancakes and you have 9 cups of flour.

Answer 1

Solution (a) :-

Quantity of flour needed to make 20 pancakes =

$= 1 \frac{2}{3} \:$

$= \frac{3 \times 1 + 2}{3}$

$= \frac{5}{3} \: cups \: of \: flour$

Then , number of pancakes that can be made from 1 cup of floor :-

$20 \div \frac{5}{3}$

$20 \times \frac{3}{5}$

$\frac{60}{5}$

$= 12 \: pancakes$ .

Therefore , 12 pancakes can be made from 1 cup of floor .

Solution (b) :-

Number of pancakes that can be made with 1 cup of flour = 12 pancakes

Number of pancakes that can be made with 9 cups of flour :-

= 9 × 12

= 108 pancakes

Therefore , I can make 108 pancakes with 9 cups of flour .

Solution (c) :-

Yes , I have enough flour to make 100 pancakes . I say this because :-

With one cup of flour I can make = 12 pancakes

With 9 cups of flour I can make =

= 9 × 12

= 108 pancakes

As I can make 108 pancakes with 9 cups of flour , I can conclude that I have enough flour to make 100 pancakes .