Topic: Number system
Difficulty level: Average
You will get word problems like this in your exams.
The concepts involved in this problem are
1. Equations
Method 1:
This method will take time as you need to read the question, write equations, and solve them. Time consuming!!
First let us assume variable x
Method 2:
The previous approach involves equations. Some of us
- don’t like solving equations
- tend to make errors while solving equations..
This approach is faster, involves using answer options as an additional tool to arrive at the answer
First you need to arrive at the equation as described earlier
Hence option D should be the correct answer
Take-away:
Use the answer options . substitute them in the equation and check if the Left hand side of the equation = right hand side of the equation)
Watch this tutorial video and understand mathematical reasoning skills..
You can excel in math once you learn these skills.
Ready for more
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