Bill has 12 more than three times the number of baseball cards Chyris has. Bill has 42 cards more than Chris. How many baseball cards does Chris have?

Answer 1

Chris = X cards
Bill = 3X + 12 cards.

X + (3X +12) = (X + 42) + X
4X - 2X = 42 - 12
2X = 30
X = 15 cards

Answer 2

Chris --x
Bill --- x+42

"Bill has 12 more than three times the number of baseball cards Chyris has" ---> x+42 = 3x + 12

solve