There is a really easy way to find this out I can't really help you so if you just look it up on google you should get your awnser
Answer:
51.23
Step-by-step explanation:
Austin would have 6 jelly beans and Alex would have 18 because if Alex were to have three times as many jellybeans as Austin that means Austin will have one times and Alex would have three times which equals four so you would have to divide 4÷24 which gives them six for each group
Looks to me like a trapezoid
Edit: Isosceles trapezoid