Homework Help: Math Help plz!!! Really need help.

Posted by Jolley on Tuesday, November 28, 2006 at 8:25pm.

Use the Systematic Trial to solve this problem.

Peanut-Pecan Problem

Peanuts sell at $5/kg and pecans sell at $20/kg. Marika wants to make 30kg of a mixture of peanuts and pecans that will s ell at $10/kg/ How many kilograms of peanuts and pecans should she use?

Help plz. Plz explain how you got the answer.

Let x = kg peanuts
y = kg pecans
===================
equation 1. x + y = 30
equation 2. $5x + $20y =$10*30
===============================
Solve the two equations for x and y. Post your work if you get stuck and need further assistance.

I dont get it why did you need help for that easy pesey problem?

evryone is at different stages, what is easy for you is new to others

Math Help plz!!! Really need help. - Shylisa, Thursday, December 11, 2008 at 7:05pm
->Let x repersent the mass of peanuts
->Mass of pecans:30-x
->The Value of peauts:5x
->Value of pecans:20(30-x)
Equation: 5x + 20 (30-x)= 10(30)
*Please note a number before the bracket means tp multiply*
5x + 600 x - 20 = 300
->move + 600 to the other side of the equal sign, it becomes a negative - 600.
-> x-20 just make it a 20x
5x - 20x = 300 - 600
-15x = -300
->So negative 15 equals negative 300
->Next divide -15x by -15 and -300 by -15
-15x = -300
----- -----
-15 -15
x = 20 Kg (the mass of peanuts)
-> Mass of pecans: 30 - x whitch is 30 - 20 = 10kg

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