Question

Which of the following are linear equations in one variable?

• A. I have a certain number of chocolates. If I get 5 more chocolates, the total number of chocolates increases to 20.
• B. I have certain number of chocolates. The price of each chocolate is 2 more than the number of chocolates I have.
• C. My sister’s age is twice my present age. 2 years hence , her age will be 20 more than my age.
• D. More than 1 correct option.

Answer 1

The correct option is A

I have a certain number of chocolates. If I get 5 more chocolates, the total number of

chocolates increases to 20.

(a) $x+5=20$ (number of chocolates is the only variable) is the correct option

(b) $y=2+x$ (number of chocolates and price of each chocolate are 2 variables)

(c) $x=2y$ and $(x+2)+20=(y+2)$ ( Sister’s age and my age are 2 variables)