Susan can type 10 pages in 5 minutes. Mary can type 5 pages in 10 minutes. Working together, how many pages can they type in 30 minutes?A. 15B. 20C. 65D. 75

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Sandeep Jindal

  • Jun 30th, 2005
 

Answer will be 75.  
 
Susan = 10*6 
Mary = 5*3 
Total = 60+15= 75

dandiedimp

  • Jul 10th, 2010
 

Let "x" as the total number of pages both can type in 30 minutes.  
10/5 + 5/10 = x/30
We can't add 10/5 and 5/10 since they have different denominator. LCD is 10, we need to multiply 10/5 by 2 to make it 20/10.
20/10 + 5/10 = x/30
We can now add the fractions.
25/10 = x/30
To get the value of "x" we need to cross multiply 10*x  and 25*30 would result.
10x = 750
To get the value of "x" divide 750 by 10
x=750/10
x= 75.

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shanker

  • Jul 29th, 2015
 

75

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ZINABU

  • Mar 28th, 2018
 

STEP1: write the ratio:10/5+5/10=x/30
STEP2: use the LCD number
the LCD number for this is 10
step3: 10*2/10 +5/10=x/30
20/10+5/10=x/30
25/10=x/30
25*30=x*10
x=750/10
=75

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