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STALIN [3.7K]
3 years ago
15

PLEASEEE HELLPPP!!!!!!!!

Mathematics
1 answer:
belka [17]3 years ago
5 0

Answer:

4.25 i think

Step-by-step explanation:

sorry i    have not done these in a while it might be wrong

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Read 2 more answers
A school bought pens, each costing $1, and pencils, each costing $0.5. The cost of the whole purchase was $220. How many pens an
Aleks [24]

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

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<u>So, the number of pens = 120 and the number of pencils = 200</u>

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3 years ago
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