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21 Jan 2019, 00:27
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Question Stats:

83% (01:40) correct 17% (01:03) wrong based on 8 sessions

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A certain store sells only shirts and ties. The price of a shirt is $40 and the price of a tie is$20. If Bob pays $340 for 10 items from this store, how many shirts did he purchase? A 3 B 4 C 5 D 6 E 7 _________________ Director Joined: 18 Jul 2018 Posts: 675 Location: India Concentration: Finance, Marketing WE: Engineering (Energy and Utilities) Re: A certain store sells only shirts and ties. e price of a shirt is$40  [#permalink]

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21 Jan 2019, 02:20
40S+20T = 340
2S+T = 17
Also, S+T = 10, T = 10-S
2S+10-S = 17
S = 7

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Joined: 31 Oct 2013
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Re: A certain store sells only shirts and ties. e price of a shirt is $40 [#permalink] ### Show Tags 21 Jan 2019, 02:49 Bunuel wrote: A certain store sells only shirts and ties. The price of a shirt is$40 and the price of a tie is $20. If Bob pays$340 for 10 items from this store, how many shirts did he purchase?

A 3
B 4
C 5
D 6
E 7

Back solve the question.

shirt/piece = 40

tie/piece = 20

Total price = 340.

Total 10 items. Given choices are the number of shirts.

Option E) 7 shirts. So, tie must be 3.

7 * 40 = 280

3 * 20 = 60.

280 + 60 = 340.
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Re: A certain store sells only shirts and ties. e price of a shirt is $40 [#permalink] ### Show Tags 21 Jan 2019, 07:11 Bunuel wrote: A certain store sells only shirts and ties. The price of a shirt is$40 and the price of a tie is $20. If Bob pays$340 for 10 items from this store, how many shirts did he purchase?

A 3
B 4
C 5
D 6
E 7

$$40s + 20t = 340$$

Or, $$2s + t = 17$$

Further , $$s + t = 10$$

Substitute $$t = 10 - s$$ and solve

$$2s + 10 - s = 17$$

Or, $$s = 7$$ , Thus Answer must be (E)
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