Mathematics
Grade-7
Easy
Question
Murphy makes changes to the length of his wall. It is changed from 18 feet to 30 feet. The percent change is ________.
- 20%
- 66%
- 28%
- 45%
Hint:
To find the percentage change in the length of wall we will first find the diffrence in the length of the wall by substracting the old length from the new length and then using the percentage change formula to find the change %.
The correct answer is: 66%
STEP BY STEP SOLUTION
old length of the wall = 18 inch
New length of the wall = 30 inch
Change in the length of the wall = New length - Old length
Change in the length of the wall = 30 - 18 = 12
Change % = 
Change %= 
The length of the wall changed by 66%
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