Luis Marissa and Federico are raising money for a school trip Luis has raised 6/7 of the total amount needed, Marissa has raised 5/9 of the total amount needed and Federico has raised 11/10 of the total amount needed. Who has raised the MOST Money

Fredrico

The obvious answers because it is the only mixed fraction. It is already more than the others

OR you can say

Lcm of 7, 10, 9 is 630

9=3×3
10=2×5
7=7

Looking at the prime factorizations, all the factors need to be included. And so we'll get:
2×3×3×5×7=630

Let's check it:
630=9×(2×5×7)

630=10×(3×3×7)

630=7×(2×3×3×5)

The new fractions would be

540/630 for Luis

350/630 for Marissa

And 693/630 for Federico

A) 144.44 sq inches i believe