School Fundraising Ideas

1. crazykoolhelper Said,

   You have to set up to equations and do linear combinations to solve.
   x-> small pizza y-> large pizza
   x + y = 45
   7x + 10y = 402
   do linear comibnations
   References :

2. Cameron Said,

   What you want to do is create two equations with two unknowns. Using the universal variables (x,y) we know that x + y = 45. We also know that 7x + 10y = 402.

   If you times the first equation by 7 you get 7x + 7y = 315. Now, subtract the second equation. You get -3y = -87. So, Y equals 29. Then X equals 45-29 which is 16.

   So, there were 16 small pizzas and 29 large pizzas. We can check this because 16*7 plus 29*10 should equal 402. Sure enought, 112+290 does equal 402.
   References :

3. dogsafire Said,

   S + L = 45
   7S + 10L = 402

   Solving by substitution:
   S = 45 – L

   7(45 – L) + 10L = 402
   315 – 7L + 10L = 402
   3L = 87
   L = 29

   S = 45 – L = 45 – 29 = 16
   References :

4. Mike S Said,

   L+S=45 (number sold)
   7S+10L=402 (money collected)

   L=45-S

   7S+450-10S=402
   48=3S
   S=16 , hence L=29 number sold
   References :

5. Mrs. Hernandez Said,

   something times 7 had to make that 2 at the end. What times 7 makes a 2 at the end????
   well how about 7*6=42

   subtract 42 from 402

   402
   - 42
   _____
   360

   how many tens go into 360?

   10

   360/10=36

   Sooo……..

   Six $7 pizzas were sold as well as 36 $10 pizzas.
   References :

6. vlee1415 Said,

   x = # of small pizza sold
   y = # of large ones sold
   so
   (1) ` ` ` ` ` ` x + y = 45
   (2) ` ` ` ` ` 7x + 10y = 402
   (1) x 7 ` ` 7x + 7y = 315
   subtracting ` ` 3y = 87
   y = 29 large pizza
   x = 16 small pizza
   References :

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