Answer:
467.50
Step-by-step explanation:
do 61.5 times 5 to get 307.5 and add to 160 to get 467.50
3 cards
1/4 = x/12 1/4 = 3/12
4 * 3 = 12
1 * 3 = 3
x = 3
5/8 that's how ratio of students that will buy lunch. so in order to find number students who will buy the lunch out of 720, just multiply 720 with 5/8 ie, 720x5/8 ie 450.
450 is answer
-3, 3, 5.
https://www.wolframalpha.com/input/?i=%28x%5E3%29-%285x%5E2%29-9x%2B45%3D0