18% of 40 is 7.2
Change the percentage (18%) into a decimal by dividing it over 100:
18/100 = 0.18
Divide 7.2 by the decimal (0.18):
7.2 / 0.18 = 40
If one pound of yogurt cost 55 (cents?) then, Two yogurts cost $1.10
Three yogurts cost $1.65
Four yogurts cost $2.20
Five yogurts cost $2.75
Six yogurts cost $3.30
![13 \sqrt[4]{x} -10 \sqrt[4]{2y}](https://tex.z-dn.net/?f=13%20%5Csqrt%5B4%5D%7Bx%7D%20-10%20%5Csqrt%5B4%5D%7B2y%7D%20)