To produce an old photograph, a photographer charges x dollars to make a negative 3x/5 dollars for each of the first 10 prints, and x/5 dollars for each print in excess of 10 prints. If 45 dollars is the total charge to make a negative and 20 prints from an old photograph, how many dollars the photographer charges to make a negative?

dsuc.created: 7 years ago | dsuc.updated: 1 week ago

dsuc.updated: 1 week ago

3.5

4.5

None of these

Oil & Gas Co. Ltd Petroleum Exploration Co - Officer - 17.04.2009 গণিত

dsuc.explanation

637

common.best_ans:

To reproduce an old photograph, a photographer charges x dollars to make a negative, 3x/5 dollars for each of the first 10 prints, and x/5 dollars for each print in excess of 10 prints. If $45 is the total charge to make a negative and 20 prints from an old photograph, what is the value of x?

Answer:

a negative charge=x

first 10 prints charge= 10*3x/5=30x/5 = 6x

other 10 prints charge= 10*x/5=10x/5=2x

x+6x+2x = 45

9x = 45

x = 5

2 years ago

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