B. 360
C. 1
D. 720
Answer:
Option B is the answer.
Step-by-step explanation:
I own 6 hats and i am taking 4 hats on vacations.
I have to find the number of ways that I can choose 4 hats out of 6.
In this question we will apply the combination rule.
So by combination rule number of ways to choose hats will be
=15
Therefore, option A. 15 will be the answer.
Answer: 56
Step-by-step explanation:
Let the number of $5 be x
Let the number of $2 be y.
Based on the information given, we can form an equation as:
x + y = 128 ........ i
5x + 2y = 424 ....... ii
Multiply equation i by 2
Multiply equation ii by 1
2x + 2y = 256 ...... iii
5x + 2y = 424 ....... iv
Subtract iii from iv
3x = 168
x = 168/3
x = 56.
Therefore, there were 56 $5 bills.