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Find 45 minute classes

  1. Dec 1, 2017 #1
    1. The problem statement, all variables and given/known data
    One company offers 45 minute classes at 12$ per class. If the number of minutes Randilf spent during Yoga this month was 132 greater than the number of dollars he paid, how many classes did he attend?

    2. Relevant equations

    No standard eq
    3. The attempt at a solution
    First class = 1-45min
    Second class = 45-90 min
    Third class less thank 45 minutes
    So classes attended is 2 which is not correct. Some body please guide me.

    Zulfi.
     
  2. jcsd
  3. Dec 1, 2017 #2

    Ray Vickson

    User Avatar
    Science Advisor
    Homework Helper

    Let N = number of classes he attends. Set up an equation in N and solve it.
     
  4. Dec 1, 2017 #3

    Mark44

    Staff: Mentor

    ???
    I don't see what you're trying to do here.
    Starting with Ray's suggestion, write one expression that represents the number of minutes he was in class, and another that represents the cost for that many classes.
     
  5. Dec 2, 2017 #4
    Let N= number of classes:
    1st eq:
    1 class = 45 min
    N classes= N * 45 minutes
    2nd eq:
    45 min = 12$
    N * 45 min = N * 12$

    Is it correct?

    Zulfi.
     
  6. Dec 2, 2017 #5

    Ray Vickson

    User Avatar
    Science Advisor
    Homework Helper

    Don't ask---just solve it and check whether your solution satisfies the conditions of the problem.

    When you continually ask "is it correct" half-way through a solution (as you do over and over again in many of your threads) you are not developing the necessary confidence in your own abilities. What would you do on an exam, where you cannot ask anyone?
     
  7. Dec 2, 2017 #6

    Mark44

    Staff: Mentor

    No.
    1) As an equation, 45 minutes does NOT equal $12. The units don't match at all.
    2) Your second equation is wrong as well. You are omitting important information in this problem.
    What Ray said...
     
  8. Dec 5, 2017 #7
    Hi,
    Please simplify the prob. I cant understand it.

    I am block.
    In my view this is not logical of forum. Right now i am not in exam. And in forum i can interact. For good score I must solve variety of problems. And i need help thats why i posted on forum.


    Zulfi.
     
    Last edited by a moderator: Dec 5, 2017
  9. Dec 5, 2017 #8

    Mark44

    Staff: Mentor

    Let N = the number of classes Randilf was in this month.

    How many minutes was Randilf in class this month?
    How many dollars did Randilf spend for the classes this month?
    Are these two numbers equal?
    If not, which one is larger, and by how much?
     
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