Mathematics
Grade-7
Easy

Question

Ronnie charged his customers a flat fee of $25 to fix computers. Then he charged $20 for each hour that he spent fixing the computer. If Ronnie made $175 off of his first customer, then find the total hours he spends on working.

  1. 20c - 25 = 175
  2. c/20 + 25 = 175
  3. 20c + 25 = 175
  4. 20c =175

hintHint:

In this question, Ronnie charged flat fee of $25 to fix computer. Each hour fixing charge is $20 and total money he made to his first customer is $175. $25 is fixed money but $20 is not fixed its change at per hour and its increasing. Lets assume hour be c and write the equation.

The correct answer is: 20c + 25 = 175


    Here we have to write find the equation of given problem.
    Firstly, the statement says,
    Ronnie charge flat fee of $25 dollar to fix computer, that means it is constant number
    Each hour fixing charge is increased by $20, it is not constant it can changed,
    And the total he made is $175
    Let assume hour be c ,
    Then the equation of given situation would be,
    25 + 20c = 175,
    After solving , c = 7.5 hour,
    Therefore, the correct answer is 20c + 25 = 175.

    In this question, two term were given one is fixed number and another is not fixed. The not fixed number is always would be variable. Writing equation after knowing these two terms would be easy.

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