SOLUTION: Yolonda has 7 more baseball cards than Jeff. Jeff has three times as many baseball cards as Clara. All together, they have 21 baseball cards, how many does Clara have?

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Question 1152110: Yolonda has 7 more baseball cards than Jeff. Jeff has three times as many baseball cards as Clara. All together, they have 21 baseball cards, how many does Clara have?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
y, Yolanda
j, Jeff
c, Clara




More than one way to go.

You could try sub for j.
Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!
,

Let x be the number by Clara; 

then the number by Jeff is 3x  and the number by Yolonda is (3x+7).


The equation is  


    x + 3x + (3x + 7) = 21.


Simplify step by step and solve


    7x = 21 - 7

    7x = 14

     x = 14/7 = 2.


ANSWER.  Clara has 2 baseball cards.

Solved.

---------------

Never even try to solve this simple problem (and other similar problems) in a way as @josgarithmetic teaches you.

His way is the way to   N O W H E R E.

The problem is  extremely simple,   and the solution method/methods should be adequately simple.



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