Question

A rope is 240 cm long is cut into two parts in the datio 5:7. What is the length of each part ?

Answer 1

Let the two sides be 5x,7x
5x+7x=240
12x =240
x=20
5x=5*20=100 cm
7x=7*20=140 cm
1st part =100cm
2nd part =140cm

Answer 2

let the parts be 5x and 7x
5x+7x=240
12x=240
x=240/12
x=20
so, the first part is 5×20=100
and the other part is 7×20=140