Can somebody tell me the only correct

The equation describes the problem C.

Why?

If we need to find which of the problem situation is represented by the equation, we need to solve the equation and check which makes sense.

Checking the problem C, we can see that it's the correct option.

We have the following equation:

Solving, we have:

We can see that her sister is 30 years old.

If we substitute the value into the equation, we can see that the equation is satisfied, so, it's the correct option.

The correct option is C.

Have a nice day!

answer: 2 and 1

step-by-step explanation: got this question

in if you ask questions, the points are taken from your total and given to the one who answered it..

so if i have 30 points and i ask a question for 5 points, then when someone asks a question i will lose 5 points and the answerer earns 5

happy to