Solve for the Variable Involving Mixed Operations

We use inverse operations to solve the equation for a variable.
 

For example, consider the equation 4a – 7 = 33.

 

To find the value of a, first of all, add 7 to both the sides of the equation.
 

4a – 7 + 7 = 33 + 7    
 

4a = 40
 

Now, divide both sides by 4 to find the value of a.    

 

4a
4
 = 
40
4

  a = 10  





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The correct answer is

Remember :

The smallest number is the one that comes first while counting.

Solution :

To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.

21,27,23

21 is the smallest number.