Answer:
25:12
Step-by-step explanation:
First you have to convert both amounts into the same unit. So;
<em>5m × 100 = 500 cm </em>
We're multiplying by 100 because a metre is 100 times bigger than 1 cm.
This changes the ratio from 5:240 to 500:240, which makes it easier to get to your end result.
Now, find the Highest Common Factor of both 500 and 240 - much like you do when simplifying fractions.
Factors of 240 = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, <u>20</u>, 24, 30, 40, 48, 60, 80, 120 and 240.
Factors of 500 = 1, 2, 4, 5, 10, <u>20</u>, 25, 50, 100, 125, 250 and 500.
We then <u>divide both numbers by the HCF</u>, which we've just figured out is 20;
240 ÷ 20 = 12
500 ÷ 20 = 25
<h2>And there's your answer, <u>25:12</u></h2>