Question

A landscaper wants the length and width of a lawn each increased by 20%. The current dimensions of the lawn are 18 feet x 24 feet. Which of the following are the dimensions of the new lawn? A. 19.8 feet x 26.4 feet B. 20 feet x 26 feet C. 21.6 feet x 28.8 feet D. 23 feet x 29 feet

Answer 1

The key of this question is to calculate the 20%. Recall that to do that, you can do as follows. Whenever you want to calculate the x % of a number, you multiply the number by x and then divide it by 100. So, in this case, we are going to calculate the 20% of 18 and the 20% of 24.

For 18:

`18\cdot\text{ }(20)/(100)=\text{ 3.6 }`

For 24:

`24\cdot\text{ }\frac{20}{100\text{ }}\text{ = 4.8}`

So now, we should add each calculation to the original lenght, so we have increased each lenght by 20%.

Then our final results are

18 + 3.6 = 21.6

24 + 4.8 = 28.8

So the correct answer is option C.