**Question:**

A certain no. Is divided into two parts such that 5 times the first part added to 11 times the second part makes 7 time the whole. The ratio of the first part to the second part is

2:1

for non zero y

5r+11=7r+7

2r= 4

r = 1:2

It means that

x:y=1:2, y:x = 2:1

Critically we cant always say that one is double to another why? Becoz it is fixed that which one is double to next __one__

2:1

2:1

5x + 11y = 7(x + y)

x = 2y

x/y = 2/1

2:1

2:__1__

Let number is divided in x & y

Then

5X+11y= 7(x+y)

X=2y

X/y=2/1

Ans: 2:1

2/1