Divide the sum of 1 / 5 and 2.4 by 13 to get the quotient

Divide the sum of 1 / 5 and 2.4 by 13 to get the quotient

Problem 1: suppose the number is x and there is an equation
The △ 1 / 5 + 1 / 2 = 9 / 2
X×5 +1 / 2 = 9/2
5 times = 9 / 2-1 / 2
5 = 4
X = 4/5
A: the number is 4 / 5
Question 2: suppose the number y has a formula
7/13÷Y = 9/11×11/3
7/13÷Y = 3
Y = 7/13÷3
Y = 7 / 13×1/3
Y = 7/39
A: the number is 7 / 39

What is the sum of 25% of 12 plus 3 / 4 divided by 3 / 8?

12*25%+3/4÷3/8=3+2=5

29 minus 18 divided by 3, how much less than 120?

【】【】【】
120-（29-18÷3）
=120-（29-6）
=120-23
=97
The result is 97% less than 120

What's the 80% difference of subtracting 120 from 135

150-（120✘0.8）=39