Answer:
x=15
Step-by-step explanation:
2/5x+1/2=x+5
2x+5/2=x+25
4x+5=x+50
3x+5=50
3x=45
x=15
Answer: 13
Explanation: 13 = prime
30 = composite
49 = composite
65 = composite
87 = composite
Let L and H represent length and height, respectively.
.. 20 ft = (4/5)*L
.. L = (5/4)*(20 ft) = 25 ft . . . . . . . . multiply by the reciprocal of the coefficient of L
.. H = (2/9)*(L +20 ft)
.. = (2/9)*(25 ft +20 ft))
.. = (2/9)*(45 ft) = 10 ft
The volume is the product of length, width, and height.
.. V = (25 ft)*(20 ft)*(10 ft) = 5000 ft^3