first add the ratio 5+7= 12
so, 12 is equal to 120
1 part is equal to 120/12 or 10
we know that 1 part is equal to 10
so, 5 parts ------> 5 times 10 = 50
7 parts ------> 7 times 10 = 70
50+70= 120 so we got the correct answer.
.:, 120 is divided into two parts and that is 50 and 70.
