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A waitress's income consist of her salary and tips. During

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by fskilnik@GMATH » Tue Jan 29, 2019 4:07 am
AAPL wrote:GMAT Prep

A waitress's income consist of her salary and tips. During one week, her tips were 5/4 of her salary. What fraction of her income for the week came from tips?

A. 1/9
B. 1/6
C. 1/3
D. 4/9
E. 5/9
$$? = {{{\rm{tips}}} \over {{\rm{salary}}\,\,{\rm{and}}\,\,{\rm{tips}}}} = {{{5 \over 4}\left( {{\rm{salary}}} \right)} \over {\left( {{4 \over 4} + {5 \over 4}} \right)\left( {{\rm{salary}}} \right)}} = {5 \over 9}$$

Alternate way (exploring a particular case):

$${\rm{salary}} = 4\,\,\, \Rightarrow \,\,\,{\rm{tips}} = 5\,\,\,\,\,\, \Rightarrow \,\,\,\,\,\,\,? = {5 \over {4 + 5}} = {5 \over 9}$$

We follow the notations and rationale taught in the GMATH method.

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Fabio.
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by Brent@GMATPrepNow » Tue Jan 29, 2019 5:42 am
AAPL wrote:GMAT Prep

A waitress's income consist of her salary and tips. During one week, her tips were 5/4 of her salary. What fraction of her income for the week came from tips?

A. 1/9
B. 1/6
C. 1/3
D. 4/9
E. 5/9
APPROACH #1 - start with a convenient value of the server's salary
Let's say her salary is $4

GIVEN: her tips were 5/4 of her salary
5/4 of $4 = $5
So, her tip total was $5

What fraction of her income for the week came from tips?
Income = salary + tips
= $4 + $5 = $9
Fraction = $5 /$9

Answer: E
-------------------------
APPROACH #2 - Algebraic

Let x = her salary (in dollars)

GIVEN: her tips were 5/4 of her salary
So, tips = 5/4 of x
= 5x/4
So, her tip total was 5x/4 dollars

What fraction of her income for the week came from tips?
Income = salary + tips
= x + 5x/4
= 4x/4 + 5x/4
= 9x/4
Fraction = (5x/4) /9x/4
= (5x/4)(4/9x)
= 5/4

Answer: E

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Brent
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by Scott@TargetTestPrep » Thu Jan 31, 2019 5:36 pm
AAPL wrote:GMAT Prep

A waitress's consist of her salary and tips. During one week, her tips were 5/4 of her salary. What fraction of her income for the week came from tips?

A. 1/9
B. 1/6
C. 1/3
D. 4/9
E. 5/9

OA E
We can let x = her salary for the week and so her tips = 5x/4.

To determine the fraction that her tips represent out of her total income, we use: fraction = tips/total income. Thus, her tips are (5x/4)/(x + 5x/4) = (5x/4)/(4x/4 + 5x/4) = (5x/4)/(9x/4) = 5/9 of her income.

Alternate Solution:

Since her tips are 5/4 of her salary, she made more from the tips than her salary. Thus, the fraction of her income for the week that came from the tips must be greater than 1/2. The only answer choice that is greater than 1/2 is E.

Answer: E

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[email protected]

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