While a family was away on vacation, they paid

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Gmat_mission: Legendary Member; Posts: 1622; Joined: Thu Mar 01, 2018 7:22 amFollowed by: 2 members

by Gmat_mission » Sat Apr 06, 2019 4:40 am

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While a family was away on vacation, they paid a neighborhood boy $11 per week to mow their lawn and $4 per day to feed and walk their dog. If the family was away for exactly 3 weeks, how much did they pay the boy for his services?

A. $45
B. $54
C. $71
D. $95
E. $117

[spoiler]OA=A[/spoiler]

Source: Official Guide

Source: Beat The GMAT — Problem Solving | Sat Apr 06, 2019 4:40 am

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Brent@GMATPrepNow: GMAT Instructor; Posts: 16206; Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members; Location: Vancouver, BC; Thanked: 5254 times; GMAT Score:770

by Brent@GMATPrepNow » Sat Apr 06, 2019 7:01 am

Gmat_mission wrote:While a family was away on vacation, they paid a neighborhood boy $11 per week to mow their lawn and $4 per day to feed and walk their dog. If the family was away for exactly 3 weeks, how much did they pay the boy for his services?

A. $45
B. $54
C. $71
D. $95
E. $117

[spoiler]OA=A[/spoiler]

Source: Official Guide

..... paid a neighborhood boy $11 per week to mow their lawn...
So, in 3 weeks, the amount the family paid for lawn-moving = (3 weeks)($11/week) = $33

...the family paid $4 per DAY to feed and walk their dog...
3 weeks = 21 DAYS
So, the amount the family paid for dog care = (21 days)($4/day) = $84

TOTAL amount paid = $33 + $84 = $117

Answer: E

Cheers,
Brent

Brent Hanneson - Creator of GMATPrepNow.com

swerve: Legendary Member; Posts: 2604; Joined: Sun Oct 29, 2017 2:04 pmFollowed by: 6 members

by swerve » Sat Apr 06, 2019 9:48 am

Notice that

1. Family paid $11 per week to mow their lawn.
2. Family paid $4 per day to feed their cows.

Requirement:
To find out the total cost of the family during 3 weeks trips.

$3*11 = 33$
$21*4 = 84$

$(33+84) = \$117$

Hence, __E__ is the correct answer.

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