Answer:
[tex]90^{o}F[/tex].
Step-by-step explanation:
Let x be warmest temperature on May 15.
We have been given that the lowest temperature on May 15 is 2/3 as warm as the warmest temperature on May 15. The lowest temperature on May 15 is [tex]60^{o}F[/tex].
We can set our given information in an equation as: [tex]\frac{2}{3}x=60[/tex].
Now let us solve for x by multiplying both sides of our equation by 3.
[tex]3*\frac{2}{3}x=3*60[/tex]
[tex]2x=180[/tex]
[tex]x=\frac{180}{2}[/tex]
[tex]x=90[/tex]
Therefore, the warmest temperature on May 15 was [tex]90^{o}F[/tex].