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Mary’s annual income is $15,000 and John’s annual income is [#permalink]

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04 Mar 2013, 07:50

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Mary’s annual income is $15,000 and John’s annual income is $18,000. By how much must Mary’s annual income increase so that it constitutes 55% of Mary and John’s combined income?

Re: Mary’s annual income is $15,000 and John’s annual income is [#permalink]

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04 Mar 2013, 08:02

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megafan wrote:

Mary’s annual income is $15,000 and John’s annual income is $18,000. By how much must Mary’s annual income increase so that it constitutes 55% of Mary and John’s combined income?

Let Mary's income increase by x, then the equation will be 15,000 + x= (55/100)* (15,000 + x + 18000 ) 15,000 + x = (11/20) * (33,000 + x) 300,000 + 20x = 11x + 363,000 9 x = 63,000 x = 7,000 So, Answer will be C

Mary’s annual income is $15,000 and John’s annual income is $18,000. By how much must Mary’s annual income increase so that it constitutes 55% of Mary and John’s combined income?

Try the middle number: if Mary's annual income increase by $7,000, her income will be $22,000 and combined income will be 22,000 + 18,000 = $40,000. 55% of $40,000 is exactly $22,000.

Re: Mary’s annual income is $15,000 and John’s annual income is [#permalink]

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07 Jul 2013, 19:06

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Mary’s annual income is $15,000 and John’s annual income is $18,000. By how much must Mary’s annual income increase so that it constitutes 55% of Mary and John’s combined income?

Let X be the combined income. Since only Mary's income is increasing then John's income 18000 must constitute 45% of the total income , thus 18000 = 45% of X X = 18000*100/45 X= 40000

Thus increase in Mary's income is 40000 - (18000+15000) = 7000.

Re: Mary’s annual income is $15,000 and John’s annual income is [#permalink]

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04 Feb 2014, 14:23

megafan wrote:

Mary’s annual income is $15,000 and John’s annual income is $18,000. By how much must Mary’s annual income increase so that it constitutes 55% of Mary and John’s combined income?

Should they mention to constitute 55% of Mary and John combined income after the increase? Cause for me it is not 100% clear. What do you guys think about the language?

Re: Mary’s annual income is $15,000 and John’s annual income is [#permalink]

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26 Mar 2015, 05:36

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megafan wrote:

Mary’s annual income is $15,000 and John’s annual income is $18,000. By how much must Mary’s annual income increase so that it constitutes 55% of Mary and John’s combined income?

Current ratio is \(\frac{15000}{33000} = \frac{15}{33}\) what should be added to denominator and numerator to make it \(\frac{55}{100}\) or \(\frac{11}{20}\) or \(\frac{22}{40}\) .

Adding 7 will make \(\frac{15+7}{33+7}\) = \(\frac{22}{40}\)

Answer 7000.

C
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Re: Mary’s annual income is $15,000 and John’s annual income is [#permalink]

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