# Algebra Problem 2

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Here’s and example of a **SMART MATH** problem for **ALGEBRA.**

### Algebra Problem 2

If and ; =?

- 5
- 7
- 9
- 11
- 13

### The Usual Way

You are suppose to remember the formula

= = 27

Also, = 189

27 = 189 – 3 (3)

27 = 189 – 9

= = = 18

Now, = + 4 (18)

= 9 + 72

= 81

**(Ans: 2)**

*Estimated Time to arrive at the answer = 90 seconds*

### The Smart Way

Simply write the values of ‘x’ and ‘y’ such that x – y = 3 and x + y = the values in the options as shown below:

5 => 4, 1

7 => 5, 2

9 => 6, 3

11 => 7, 4

13 => 8, 5

Now, start cubing the values of ‘x’ and ‘y’ and find the option for which the difference is = 189.

This should be the answer. There is no need to solve further as there cannot be more than one answer.

= 9

**(Ans: 2)**

*Estimated Time to arrive at the answer = 15 seconds*

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