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Friday, August 18 2017 @ 03:35 AM CDT
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By: vivilau1112 (offline)  Sunday, September 15 2013 @ 08:35 AM CDT (Read 607 times)  
vivilau1112

Hi everyone!Can someone help me with this question?


Miss Lee spent $1390 on soem chairs and desks. For every 2 desks bought, there were 9 chairs. The TOTAL cost of the desks was $526 more than the TOTAL cost of all the chairs.Each desk cost $43.10 more than each chair.How many chairs were bought?

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By: echeewh (offline)  Sunday, September 15 2013 @ 03:59 PM CDT  
echeewh

Hey <vivilau1112>,

Following is my worked solution:

<Total Cost>

D |------------<- 526 ->|
C |------------|

Total Cost (D + C) = 1390
Total Cost (C) = (1390 - 526) ÷ 2
= 432
Total Cost (D) = 432 + 526 = 958

<Items bought>
D : C
2 : 9

2u (D) = 958
1u (D) = 958 ÷ 2 = 479

9u (C) = 432
1u (C) = 432 ÷ 9 = 48

Difference in cost between 1u(D) and 1u(C)
= 479 - 48
= 431

Given each desk (D) cost $43.10 more than each chair (C), we have ...

1u = 431 ÷ 43.10
= 10

Number of Chairs bought
= 9u --> 9 × 10
= 90

==========

Trust this helps.

Do let me know again if this is different from your <Answerkey> or if there's further clarification.

Cheers,
Edward

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