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
