Answer:
<u>The number of pens = 120 and the number of pencils = 200</u>
Step-by-step explanation:
Let the number of pens x, and the number of pencils is y
the cost of one pen $1, and the cost of one pencil $0.5
The cost of the whole purchase was $220
1 * x + 0.5 * y = 220
x + 0.5 y = 220 ⇒ eq.(1)
there were 80 more pencils than pens
y - x = 80 ⇒ eq.(2)
from eq.(2) x = y - 80
By substitution with x from the last equation at eq.(1)
∴ (y - 80) + 0.5 y = 220
1.5y = 220 + 80 = 300
y = 300/1.5 = 200
x = y - 80 = 200 - 80 = 120
<u>So, the number of pens = 120 and the number of pencils = 200</u>
Answer:
(Q) Find the amount in the account at the end of 1 year.
(A) $8,190
2.
(Q) Find the amount in the account at the end of 2 years.
(A) $16,380
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7,1
14,2
21,3
Answer:
V= 392 ft^3
Step-by-step explanation:
We know that the volume V of a pyramid is one-third the area of the base B times the height h.
If h= 8ft and areabase = 7ft x 7ft = 49 ft^2.
Then, the Volume V is:
V = areabase x height = 49 ft^2 x 8ft = 392 ft^3
So the solution is option D.
