Posted by **petie** on Thursday, December 24, 2009 at 10:13am.

DQ sells 6 times as many orders of french fries as sonic everyday. If both sold 60 more orders DQ would only sell 3 times as many fries. How many do each sell before and after the incease?

math - DrBob222, Wednesday, December 23, 2009 at 4:34pm

S = number FF Sonic sells.

D = number FF DQ sells.

===========================

D = 6S every day.

If each sells 60 more, then

D + 60 = 3(S + 60) or

D + 60 = 3S + 120 or

D = 3S + 120

=========================

The two equators are as follows:

D = 6S

D = 3S + 120

Solve these two simultaneous equation for D and S (before the addition of 60), then add 60 to each to determine the number sold after adding 60 to each. Post your work if you get stuck.

math - petie, Thursday, December 24, 2009 at 9:14am

Where did the 120 come from?

- math -
**PsyDAG**, Thursday, December 24, 2009 at 10:35am
The 120 came from a multiplication error.

3(S + 60) = 3S +180

I hope this helps.

- math -
**DrBob222**, Thursday, December 24, 2009 at 5:14pm
PsyDAG is correct. I made two errors but they corrected each other; the final two final equations to solve simultaneously are correct.

**
**

If each sells 60 more, then

D + 60 = 3(S + 60) or

D + 60 = 3S + 120 or **This should be
**

D + 60 = 3S + 180 which leads to

D = 3S + 120 and that is the same as the original. I was thinking faster than I was writing.

D = 3S + 120

## Answer This Question

## Related Questions

- math - DQ sells 6 times as many orders of french fries as sonic everyday. If ...
- math - I'm still having trouble with this DQ sells 6 times as many orders of ...
- MATH - McDonalds sells 6 times as many orders of French fries as Harry's ...
- algebra (please help) - Two cheeseburgers and one small order of French fries ...
- math - Scott, Mike, and Holly shared an order of French fries. Scott ate x fries...
- Economics - Marginal Utility - If the price of a cheeseburger is $2 and the ...
- Algebra - A family buys 4 hamburgers and 3 orders of fries for $8.40. Another ...
- Calc - a fast food place sells 425 large orders of fries per week at price $2....
- English - How do you write the following sentence grammatically correct: At ...
- Math - Math - Cindy, Tuesday, April 29, 2014 at 8:44pm At Bobs diner, it costs $...

More Related Questions