Question

Joe bought cereal boxes as shown:
Find the number of cereal boxes Joe bought.

• A. 50
• B. 4
• C. 40
• D. 400

Answer 1

The correct option is C 40

$\text{Weight of cereal boxes bought}=16kg800g$
Weight of 1 cereal box = 420 g

∴ Number of cereal boxes bought = Weight of all boxes ÷ Weight of 1 box

Step 1: Convert the total weight of cereal boxes to a common unit (g).

$1\text{kg}=1000\text{g}$
$\Rightarrow 16\text{kg}=1000\times 16=16,000\text{g}$


So, the total weight of the cereal boxes $\text{in gram is}16,000g+800g=16,800g$

Step 2: Divide 16,800 by 420 by long division method.

$$\begin{array}{c}40\\ 42016800\\ -\underset{–}{1680}\\ 0\\ -\underset{–}{0}\\ 0\end{array}$$

∴ Joe bought 40 cereal boxes.