Answer:
[tex]\dfrac{3}{8}x=510[/tex]
Step-by-step explanation:
Let x calories be the total number of calories in the entire pizza.
Mateo ate [tex]\frac{3}{8}[/tex] of a pizza, which was a total of 510 calories of food.
Then
[tex]\dfrac{3}{8}\text{ of a pizza}\ - \ 510\text{ calories }\\ \\1 \text{ pizza }\ - \ x\text{ calories}[/tex]
Write a proportion:
[tex]\dfrac{\frac{3}{8}}{1}=\dfrac{510}{x}[/tex]
Cross multiply:
[tex]\dfrac{3}{8}x=510[/tex]
