Answer:
The answer would be D. 9w=21
Explanation:
Okay this is very simple process of elimination. when it says 2w etc it means multiply. so simply.. multiply each one by 2.5 and it equals the same thing, then. that's it.
let's try A
2x2.5=5 that cant be it because it's correct
4x2.5=10 matches up
6x2.5=15 matches up
meaning D must be the solution but let's just check to be safe
9x2.5=22.5 incorrect