document.write( "Question 176923: Joe's electric made 19 customer calls last week and 24 calls this week. How many calls must be made next week in order to maintain an average of at least 20 calls for the three week peroid? \n" ); document.write( "
Algebra.Com's Answer #131971 by Mathtut(3670)\"\" \"About 
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\"%2819%2B24%2Bx%29%2F3=20\"given--->x is our unknown value
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\n" ); document.write( "\"19%2B24%2Bx=60\"multiplied both sides by 3
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\n" ); document.write( "\"highlight%28x=17%29\"subtracted 19 and 24 from both sides to isolate x
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