Well... that's to hard for me sadly when I learned a lot how to do that, i'll give you this though when you going from bigger to smaller you divide, when you going smaller to bigger you times.
Good luck though ;)
Answer:
The first student ate 1.35lbs. The second student ate .63lbs.
Step-by-step explanation:
3/20=.15, plus another 1.2=1.35
3/5=.60, plus another .03=.63
In total, both students ate 1.98lbs of candies.
$5.55 I suppose.
3.4lbs × $4.25 per lbs= $14.45
$20.00-$14.45=$5.55