90 cars out of 450
90 / 450 = 1/5
I guess the number of floors is 5
A bag of marbles contains 12 blue marbles, 5 red marbles, and 13 green marbles. if one is selected at random, what is the probability that the selected marble is blue?
A. 0
B. 2/5
C. 13/30
D. 5/6
E. 1
Answer:
2/5
Step-by-step explanation:
Total marbles=12+13+5=30
P(that the selected marble is blue) = 12/30 = 6/15 = 2/5
Andy had 20% fewer marbles than Henry. When Andy gave 80 marbles to Henry, the number of marbles he had left was half of what Henry had. How many marbles did Andy have in the beginning?
Answer:
I think it is 400
Not 100% sure
Step-by-step explanation:
*a=andy
h=henry
(h+80)x2=a-80
20%a=h
(20%a+80)*2=a-80
40%a+160=a-80
40%a+240=a
240=a-40%a
240=60%a
400=a