Find 45 minute classes

Thread Starter

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?
 

Thread Starter

zulfi100

Joined Jun 7, 2012
557
Hi,
Thanks for your time.
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.
 
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