Question

Rina buys books worth $\$$125 and spends an equal amount of money on each book. Therefore, the cost of each book is .

• A. $\$$3
• B. $\$$4
• C. $\$$5

Answer 1

The correct option is C $\$$5

Cost of books = $\$$125

To find the cost of each book, we check whether 125 is divisible
by 3, 4 or 5.

Divisibility rule of 3 is:
If the sum of all the digits of a number is divisible by 3, then the number is divisible by 3.

Checking for 125, we get:


Now, let's check for the
divisibility rule of 4.

Divisibility rule of 4 is:
If the last two digits of a number is divisible by 4, then the number is also divisible by 4.

Checking for 125, we get:


Lastly, the divisibility rule of 5 is:
If the digit at ones place of a number is 0 or 5, then the number is divisible by 5.

Checking for 125, we get:


We can observe that $\$$125 is divisible by 5 only.

Hence, the cost of each book is $\$$5.