First, find a lowest common denominator. The lcd in this equation os 8 so your new fractions would be 4/8, 6/8, and 7/8. You add the numerators (top numbers), which equals 17/8. Then you simplify to 2 1/8 liters.
It's 21.125 hope this works good luck ;)
I hope it helps you get it right
Simone would have to bike for at least 34 miles to reach $510
It was used to see how your basic math skills