Question

The lengths of three ropes are 4 : 5 : 9. If the length of the shortest rope is 20 cm, find the length of the longest rope

Answer 1

The answer is 45
If 20/4 = 5
Then 9x5 = 45

Answer 2

Answer:

Don’t quite me on it, but 45cm?

Step-by-step explanation:

Well, if the shortest rope (4) is only 20cm, it’s about 5cm per length (?)

So, if you follow that pattern the longest (9) would be 45cm.