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An optometrist charges $150 per pair for soft contact lenses and $85

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Joined: 28 Aug 2010
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An optometrist charges $150 per pair for soft contact lenses and $85  [#permalink]

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New post 25 Dec 2010, 08:00
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Question Stats:

86% (02:24) correct 14% (03:11) wrong based on 75 sessions

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An optometrist charges $150 per pair for soft contact lenses and $85 per pair for hard contact lenses. Last week she sold 5 more pairs of soft lenses than hard lenses. If her total sales for pairs of contact lenses last week were $1,690, what was the total number of pairs of contact lenses that she sold?

(A) 11
(B) 13
(C) 15
(D) 17
(E) 19
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Re: An optometrist charges $150 per pair for soft contact lenses and $85  [#permalink]

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New post 25 Dec 2010, 08:24
Let the number of sold pairs of hard lenses be X, then the number of sold soft lenses is x+5. x+x+5=?

(x+5)*150 + x*85 =1690
235*x=940
x=4
2*x+5=13

Maybe you have forgotten to add the number of sold lenses of the other type.
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Re: An optometrist charges $150 per pair for soft contact lenses and $85  [#permalink]

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New post 25 Dec 2010, 09:18
1
ajit257 wrote:
An optometrist charges $150 per pair for soft contact
lenses and $85 per pair for hard contact lenses. Last
week she sold 5 more pairs of soft lenses than hard
lenses. If her total sales for pairs of contact lenses last
week were $1,690, what was the total number of
pairs of contact lenses that she sold?
(A) 11
(B) 13
(C) 15
(D) 17
(E) 19

Not sure about the way i solved it.


(x+5)*150 +x*85=1690
=>x=4

total lens=4+(4+5)= 13
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Re: An optometrist charges $150 per pair for soft contact lenses and $85  [#permalink]

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New post 26 Sep 2016, 23:19
1
s = h +5 ; 150(s) + 85(h) = 1690

15(h+5)+85(h) = 1690 => h =4 anf s => 4+5 = 9

h +s = 13
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Re: An optometrist charges $150 per pair for soft contact lenses and $85  [#permalink]

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New post 18 Oct 2016, 11:31
Let x = soft lenses
y = hard lenses

x = y+5

150x +85y = 1690
150(y+5)+85y = 1690 --> y = 4 --> x = 9

4+9=13 (total lenses)
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Re: An optometrist charges $150 per pair for soft contact lenses and $85  [#permalink]

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New post 04 Apr 2018, 14:10
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: An optometrist charges $150 per pair for soft contact lenses and $85 &nbs [#permalink] 04 Apr 2018, 14:10
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