Hey! For this problem, you just have to convert everything into decimals, and then percentages. To convert a decimal into a percentage, just move the decimal point two to the right and add a percent sign! For example:
The amount that Sharon ate is already converted into a decimal. 0.30 as a percentage is 30%, so she ate thirty percent of the pizza!
However, you still need to convert the amount of pizza that Austin ate from a fraction into a decimal. 5/10 is equivalent to 1/2, which is 0.50! Move the decimal point two to the right, and you get 50%.
50% plus 30% is 80%, which means that only 20% of the pizza is left for Owen!
