# Find 45 minute classes

#### zulfi100

Joined Jun 7, 2012
557
Hi,
I have got a following question.

One company offers 45 minute classes at 12$per class. If the number of minutes Randilf spent during Yoga this month was 132 greater than the number of dollars he paid, how many classes did he attend? First class = 1-45min Second class = 45-90 min Third class less thank 45 minutes So classes attended is 2 which is not correct. Some body please guide me. Zulfi. #### WBahn Joined Mar 31, 2012 24,688 If he attends N classes, how many dollars did he pay? If he attends N classes, how many minutes does he spend? Can you take it from there? Thread Starter #### zulfi100 Joined Jun 7, 2012 557 Hi, Thanks. <If he attends N classes, how many dollars did he pay?> 12 * N dollars <If he attends N classes, how many minutes does he spend?> For N classes he spent: 45 * N minutes Now : for 45N minutes paid ==== 12*N dollars I still cant understand . Zulfi. #### WBahn Joined Mar 31, 2012 24,688 You are not asked for when the number of minutes taken is equal to the number of dollars, you are asked to find when the number of minutes paid for is 132 greater than the number of minutes paid. Thread Starter #### zulfi100 Joined Jun 7, 2012 557 Hi, num of class * (45 minutes) = amount 1 * (45 minutes) = 12$

num of min * amount = 132 * (amount) + amount

I have again tried the above. I cant understand how to create the eq.

Zulfi.

#### WBahn

Joined Mar 31, 2012
24,688
Why are you multiplying 132 by anything?

Just do what the question is asking for.

(the number of minutes Randilf spent during Yoga this month) was 132 greater than (the number of dollars he paid).

Change the names to something more visual:

(the money in piggy bank #1) was 132 dollars greater than (the money in piggy bank #2).

What is the math equation that relates the amount of money in the two piggy banks?

#### zulfi100

Joined Jun 7, 2012
557
Hi,
I think this one:
(the number of minutes Randilf spent during Yoga this month) was 132 greater than (the number of dollars he paid).

eq: num_of_min = 132 min + amount_paid

(the money in piggy bank #1) was 132 dollars greater than (the money in piggy bank #2).
moneyInB1 = 132 + moneyInB2

Is the above correct?

Zulfi.

#### WBahn

Joined Mar 31, 2012
24,688
Yes. Now just put in the expressions for the num_of_min and amount_paid in terms of the number of classes and you will be on your way.