Kiran has used `\frac{4}{5}`of the pieces in his jigsaw puzzle. He has used 120 pieces. How many pieces are in the whole puzzle?

150 pieces

Step-by-step explanation:

Kiran has used 4/5 of the pieces of the puzzle.

This number translates to 120 pieces.

Assuming the total number of pieces is x, the formula for the total number is:

4/5x = 120

x = 120 ÷ 4/5

x = 120 * 5/4

x = 150 pieces