Answer:
first one
Step-by-step explanation:
Answer: 
Step-by-step explanation:
Given
The dimension of the box is

Space occupied by the box is equal to its volume i.e.

The volume of the box is
.
Use the given information to write an equation, then solve it.
$1600 = (1 + 1 + 1/2)×(monthly rent) . . . . relationship given in the problem statement
$1600/2.5 = monthly rent = $640 . . . . divide by the coefficient of monthly rent
Let, number of solid color gift sold is x and printed gift wrap is y.
Also, number of printed paper sold , 325.
Expressing, it in mathematical equation :
y = 325 ....... 1)
Also, The band needs to earn $2,500 for an upcoming competition.
So ,
3.5x + 5y = 2500 ....... 2)
Solving equation 1 and 2 :
3.5x + 5(325) = 2500
3.5x = 2500 - 1625
3.5x = 875
x = 250
Therefore, number of solid paper they must sell is 250.
Hence, this is the required solution.