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# A watch gains 7 minutes and 6 seconds every 6 days. If the rate of gai

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Math Expert
Joined: 02 Sep 2009
Posts: 51280
A watch gains 7 minutes and 6 seconds every 6 days. If the rate of gai  [#permalink]

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29 Jun 2018, 03:49
1
00:00

Difficulty:

15% (low)

Question Stats:

83% (01:14) correct 17% (01:21) wrong based on 64 sessions

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A watch gains 7 minutes and 6 seconds every 6 days. If the rate of gain is constant, how much does the watch gain in one day?

(A) 1 min 1 sec

(B) 1 min 6 sec

(C) 1 min 11 sec

(D) 1 min 16 sec

(E) 1 min 21 sec

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Re: A watch gains 7 minutes and 6 seconds every 6 days. If the rate of gai  [#permalink]

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29 Jun 2018, 03:57
Ans: C
In 6 days watch gained 7minuts and 6 second: total 426 seconds
in one day it will gain: 426/6= 71 seconds
= 1 minut and 11 sec.

Bunuel wrote:
A watch gains 7 minutes and 6 seconds every 6 days. If the rate of gain is constant, how much does the watch gain in one day?

(A) 1 min 1 sec

(B) 1 min 6 sec

(C) 1 min 11 sec

(D) 1 min 16 sec

(E) 1 min 21 sec

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Math Expert
Joined: 02 Aug 2009
Posts: 7112
Re: A watch gains 7 minutes and 6 seconds every 6 days. If the rate of gai  [#permalink]

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29 Jun 2018, 05:07
Bunuel wrote:
A watch gains 7 minutes and 6 seconds every 6 days. If the rate of gain is constant, how much does the watch gain in one day?

(A) 1 min 1 sec

(B) 1 min 6 sec

(C) 1 min 11 sec

(D) 1 min 16 sec

(E) 1 min 21 sec

Of course the method is same - divide 7 min 6 secs by 6...
You can save time if you immediately realize that 7 min means 7*60 seconds..
So divide 7 min or 7*60 secs by 6 = $$\frac{7*60}{6}=7*10=70$$
And remaining 6 seconds by 6 =1 second
Total 70+1=71 second=60+11 second = 1 min 11 second

C
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3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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Re: A watch gains 7 minutes and 6 seconds every 6 days. If the rate of gai &nbs [#permalink] 29 Jun 2018, 05:07
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