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4vir4ik [10]
3 years ago
11

Of 120 hotel rooms rented one night, some were suites rented for $115 each and the rest were double rooms rented for $85 each. I

f the total revenue from the room rentals for this night was $10,890, how many suites were rented?
A) 23
B) 35
C) 54
D) 94
E) 99
Mathematics
1 answer:
ser-zykov [4K]3 years ago
5 0

Answer: A) 23

Step-by-step explanation:

Let x represent the number of suites that were rented.

Let y represent the number of double rooms that were rented.

The total number of rooms that were rented is 120. It means that

x + y = 120

some were suites rented for $115 each and the rest were double rooms rented for $85 each. If the total revenue from the room rentals for this night was $10,890, it means that

115x + 85y = 10890 - - - - - - - - -1

Substituting x = 120 - y into equation 1, it becomes

115(120 - y) + 85y = 10890

13800 - 115y + 85y = 10890

- 115y + 85y = 10890 - 13800

- 30y = - 2910

y = - 2910/-30

y = 97

x = 120 - y = 120 - 97

x = 23

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