Use the percent equation or percent proportion to solve.

300% of what number is 742.8?

247.6

2476

2.476

24.76

247.6

Step-by-step explanation:

You can find the percent of any number using proportions. A proportion is an equation between two equal ratios. Write two ratios where one relates the percents and the the numbers that correspond to those percents.

Here it would be:

300/ 100 = 742.8/ x

Solve by cross multiplying.

300x = 74280

Divide by 300.

x = 247.6

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk