Answer

Verified

340.8k+ views

**Hint:**Variable method is a method in which we denote the unknown number with an alphabet and then treat that alphabet as a number. Use the given data and write a linear equation in x and then find the value of x. Then find the actual correct answer.

**Complete step by step solution:**

In the given question it is said that a student had to multiply a number by 2 but instead he divided that number by 2 and the answer that he got was 2. Now, we are supposed to find the actual correct answer. For this, let us first find the number which is being multiplied by 2.We shall find the number by using a variable method. Variable method is a method in which we denote the unknown number with an alphabet and then treat that alphabet as a number.

Let the unknown number whose value we have to find be x. This means that we have to find the value of x. We can do this with the given information. It is said that the student divided the number ‘x’ by 2 and got an answer of 2. This means that $\dfrac{x}{2}=2$.From the above equation we can write that $x=2\times 2=4$. Therefore, the number that is being multiplied or divided by 2 is 4. It is said that the boy had to multiply 4 by 2. We know that when we multiply 4 by 2, we get an answer of 8.Therefore, the correct answer is 8.

**Hence, the correct option is A.**

**Note:**Be careful while the linear equation in x. Students may accidently write the equation as $\dfrac{2}{x}=2$It is given that when we divide the number ‘x’ by 2, we get an answer of 2 and not 2 divided by the number ‘x’ results 2.

Recently Updated Pages

The branch of science which deals with nature and natural class 10 physics CBSE

The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths

Define absolute refractive index of a medium

Find out what do the algal bloom and redtides sign class 10 biology CBSE

Prove that the function fleft x right xn is continuous class 12 maths CBSE

Find the values of other five trigonometric functions class 10 maths CBSE

Trending doubts

How do you solve x2 11x + 28 0 using the quadratic class 10 maths CBSE

Why is the adrenaline hormone called fight or flight class 11 biology CBSE

Fill the blanks with the suitable prepositions 1 The class 9 english CBSE

Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE

Differentiate between lanthanoids and actinoids class 12 chemistry CBSE

What is the color of ferrous sulphate crystals? How does this color change after heating? Name the products formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this type of change.

Give 10 examples of unisexual and bisexual flowers

Open circulatory system is present in I Arthropods class 12 biology CBSE

Name the highest peak of the Indian Himalayas class 8 social science CBSE