###Human: Jason has a moray eel that eats 20 guppies a day and 5 betta fish who each eat 7 guppies a day. How many guppies per day does she need to buy?, ### Assistant: First find the total number of guppies the betta fish need: 5 fish * 7 guppies/fish = 35 guppies
Then add the number of guppies the eel needs to find the total number needed: 35 guppies + 20 guppies = 55 guppies 
 So the answer is :  55