Jack had to complete an assignment within the given deadline. So, he decided to write 1000 words per day. But, he could

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VJesus12: Legendary Member; Posts: 2276; Joined: Sat Oct 14, 2017 6:10 amFollowed by: 3 members

by VJesus12 » Sun Jan 17, 2021 4:33 am

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Jack had to complete an assignment within the given deadline. So, he decided to write 1000 words per day. But, he could write only 700 words per day at first, then he realized that he needs to write 8500 more words during the last 7 days before the deadline. What is the number of days, where he wrote only 700 words per day?

A. 3
B. 4
C. 5
D. 7
E. 12

Answer: C

Source: e-GMAT

Source: Beat The GMAT — Problem Solving | Sun Jan 17, 2021 4:33 am

raidamaisa: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Thu Feb 16, 2023 11:13 pm

Re: Jack had to complete an assignment within the given deadline. So, he decided to write 1000 words per day. But, he co

by raidamaisa » Thu Feb 16, 2023 11:25 pm

I am looking forward to the answer.

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8246; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

Re: Jack had to complete an assignment within the given deadline. So, he decided to write 1000 words per day. But, he co

by Scott@TargetTestPrep » Thu Mar 02, 2023 6:57 am

VJesus12 wrote: ↑
Sun Jan 17, 2021 4:33 am
Jack had to complete an assignment within the given deadline. So, he decided to write 1000 words per day. But, he could write only 700 words per day at first, then he realized that he needs to write 8500 more words during the last 7 days before the deadline. What is the number of days, where he wrote only 700 words per day?

A. 3
B. 4
C. 5
D. 7
E. 12

Answer: C

Solution:

Let n = the number of days on which he wrote only 700 words per day. Thus, we see that (n + 7) is the total number of days for the entire assignment. So we can create the equation:

700n + 8500 = 1000(n + 7)

7n + 85 = 10(n + 7)

7n + 85 = 10n + 70

15 = 3n

5 = n

Answer: C

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