3/5
Because 40/100 simplifies to 2/5 and 2/10 simplies to 1/5
1/5 + 2/5 = 3/5
Answer:
D
Step-by-step explanation:
The probability that none of the four have been vaccinated is
(1-0.63)^4 = 0.01874161
The probability that at least one has been vaccinated is the complement of this,
≈0.9813
Answer:
D.
Step-by-step explanation:
I think, don't trust me.
Answer: 141 hamburgers were sold on Tuesday.
Step-by-step explanation:
Let x represent the number of hamburgers that were sold on Tuesday.
Let y represent the number of cheeseburgers that were sold on Tuesday.
On Tuesday, a local hamburger shop sold a combined total of 564 hamburgers and cheeseburgers. It means that
x + y = 564- - - - - - - - - - -1
The number of cheeseburgers sold was three times the number of hamburgers sold. It means that
y = 3x
Substituting y = 3x into equation 1, it becomes
x + 3x = 564
4x = 564
x = 564/4
x = 141
y = 3x = 3 × 141
y = 423