Question

Dhruv has 112 sea-shells. He wants to make necklaces for his 3 friends. If he needs 28 shells for making a necklace, how many shells will he be left with him after making the necklaces?

Answer 1

So, we can see that Dhruv is left with 28 sea-shells after making three necklaces for his friends.

Alternative method:
Number of sea-shells Dhruv has = 112
Number of sea-shells required for 1 necklace = 28
To find the number of necklaces Dhruv can make using all the sea-shells:

$$\begin{array}{c}4\\ 28112\\ -\underset{–}{112}2\\ 0\end{array}$$
So, Dhruv can make 4 necklaces from the sea-shells.
But he has to make only 3 for his friends.
Hence, Dhruv is left with 28 sea-shells after making three necklaces for his friends.