The pay section I hope that helped a little bit
T >= 150
.................
Answer:
32 one-dollar bills.
Step-by-step explanation:
Let <em>x </em>represent one-dollar bills and <em>y </em>represent two-dollar bills.
He has a total of 49 bills. Therefore:

The total amount of money James has is 66. <em>x</em> is worth one dollar, while <em>y</em> is worth two dollars. Therefore:

We have a system of equations. Solve by substitution:

Therefore, James has 32 one-dollar bills and 17 two-dollar bills.
Checking:

To buy 3 books Kaitlyn will need $27
Senior = 5
Senior but Girls = 4
so P(Senior | Girl) = 4/5
Hope it helps.