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# If Biff can shape 3 surfboards in 50 minutes, how many surfboards can

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SVP
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Joined: 02 Nov 2016
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If Biff can shape 3 surfboards in 50 minutes, how many surfboards can [#permalink]

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08 Sep 2017, 06:39
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Difficulty:

5% (low)

Question Stats:

85% (00:32) correct 15% (01:14) wrong based on 75 sessions

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If Biff can shape 3 surfboards in 50 minutes, how many surfboards can he shape in 5 hours?

(A) 16 (B) 17 (C) 18 (D) 19 (E) 20

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Re: If Biff can shape 3 surfboards in 50 minutes, how many surfboards can [#permalink]

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08 Sep 2017, 08:09
If Biff can shape 3 surfboards in 50 minutes, how many surfboards can he shape in 5 hours?

(A) 16 (B) 17 (C) 18 (D) 19 (E) 20

In 5 hours, Biff can shape $$S$$ surfboards

$$\frac{3S}{50mins} * \frac{60mins}{1hr} * 5 hrs$$ = 18 surfboards

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Re: If Biff can shape 3 surfboards in 50 minutes, how many surfboards can [#permalink]

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08 Sep 2017, 08:44
If Biff can shape 3 surfboards in 50 minutes, how many surfboards can he shape in 5 hours?

(A) 16 (B) 17 (C) 18 (D) 19 (E) 20

5 hours = 300 minutes.

This is 6 times Bill takes to shape 3 surfboards.
Hence, he will shape 6 times as many boards - 18(Option C)
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Re: If Biff can shape 3 surfboards in 50 minutes, how many surfboards can [#permalink]

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10 Sep 2017, 20:49
If Biff can shape 3 surfboards in 50 minutes, how many surfboards can he shape in 5 hours?

(A) 16 (B) 17 (C) 18 (D) 19 (E) 20

3 surfboards in 50 mins . so 3*6 in 300 mins;

Ans:C 18
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Re: If Biff can shape 3 surfboards in 50 minutes, how many surfboards can [#permalink]

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11 Sep 2017, 15:53
If Biff can shape 3 surfboards in 50 minutes, how many surfboards can he shape in 5 hours?

(A) 16 (B) 17 (C) 18 (D) 19 (E) 20

Note that 5 hours = 5 x 60 = 300 minutes. We can set up a ratio:

3/50 = x/300

50x = 900

x = 18 surfboards in 5 hours

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Re: If Biff can shape 3 surfboards in 50 minutes, how many surfboards can [#permalink]

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28 Nov 2017, 07:56
Top Contributor
If Biff can shape 3 surfboards in 50 minutes, how many surfboards can he shape in 5 hours?

(A) 16 (B) 17 (C) 18 (D) 19 (E) 20

We can also solve this question be applying some number sense

NOTE: 5 hours = 300 minutes

Given: Biff can shape 3 surfboards in 50 minutes.
So: Biff can shape 6 surfboards in 100 minutes [If we DOUBLE the amount of time Biff has, we DOUBLE his output]
Likewise, Biff can shape 9 surfboards in 150 minutes. [If we TRIPLE the amount of time Biff has, we TRIPLE his output]
.
.
.
Biff can shape 18 surfboards in 300 minutes [If multiply Biff's work time by 10, we multiply his output by 10]

Cheers,
Brent
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Joined: 30 Sep 2017
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Re: If Biff can shape 3 surfboards in 50 minutes, how many surfboards can [#permalink]

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28 Nov 2017, 08:24
3->50/60
1->x

x=5/18

1->5/18
x->5

x=18

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Re: If Biff can shape 3 surfboards in 50 minutes, how many surfboards can   [#permalink] 28 Nov 2017, 08:24
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