B. 7 mc, 13 t&f
C. 2 mc, 18 t&f
D. 5 mc, 15 t&f
There are 5 multiple-choice questions on the test.
The total number of points for the test is 100. Let's assume there are x multiple-choice questions on the test. Each multiple-choice question is worth 11 points. So the total number of points for multiple choice questions is 11x. The remaining points, 100 - 11x, are for the true/false questions, each worth 3 points. To find the number of multiple-choice questions, we need to solve the equation: 11x + 3(20 - x) = 100.
Simplifying the equation gives us: 11x + 60 - 3x = 100. Combining like terms gives us: 8x + 60 = 100. Subtracting 60 from both sides gives us: 8x = 40. Dividing both sides by 8 gives us: x = 5.
Therefore, there are 5 multiple-choice questions on the test.
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Tim picks tiles randomly from the bag one at a time and fixes them to the wall.
The first tile he chooses is green.
What is the probability that the second tile he chooses will be yellow?
Express your answer as a percentage.
Answer:
30% will be yellow
Step-by-step explanation:
13 green
23 white
15 yellow
51 in all
1 green tile is chosen
50 tiles left in all
Probability of yellow.
15 out of 50 = 15/50 = 3/10 = 0.3
To percentage.
0.3 × 100 = 30
30 add %
30%
Answer:
30%.
Step-by-step explanation:
After picking the green one there are 50 tiles left in the bag.
Probability the second is yellow = number of yellow tiles / 50
= 15/50
= 3/10
= 30%.