Question

Rope pieces of lengths 45 cm, 75 cm and 81 cm have to be cut into same size pieces. What is the smallest piece length possible?​

Answer 1

2025 cm

Explanation:

Given the length of pieces - 45 cm, 75 cm and 81 cm

To find the length of the rope we have to find the L.C.M. of 45, 75 and 81 :

3 | 45, 75, 81

| ________________

3 | 15, 25, 27

|________________

3 | 5, 25, 9

|________________

3 | 5, 25, 3

|________________

5 | 5, 25, 1

|________________

5 | 1, 5, 1

|________________

| 1, 1, 1

L.C.M. = 3 × 3 × 3 × 3 × 5 × 5

= 2025 cm

So, the least length of the rope should be 2025 cm which can be cut into a whole number of pieces of length 45 cm, 75 cm and 81 cm.