So I read your question on Yahoo! and here's my answer to your question:
Question 1: "Tim has twice the number of books as Lily. Together they have 51 books. How many does Tim have? "
Solution: Let's say Tim has "T" books and Lily has "L" books.
Now, it's given that T = 2 * L and T + L = 51
So, using the first equation in the second one, we get (2 * L) + L = 51 => 3 * L = 51 => L = 51 / 3 => L = 17. Therefore, Lily has 17 books and Tim has twice that number = 2 * 17 = 34 books.
Question 2: "Joe has sent out 8 less valentine cards than Charles. Together they sent out 52 cards. How many did each send? "
Solution: Let's say Joe sent out "J" cards and Charles sent out "C" cards.
It's given that J = C - 8 and J + C = 52.
So, using the first equation in the second one, we get (C - 8) + C = 52 => 2 * C - 8 = 52
=> 2 * C = 52 + 8 => 2 * C = 60 => C = 60 / 2 => C = 30. Therefore, Charles sent out 30 cards and Joe sent out 8 less than Charles = 30 - 8 = 22 cards.
Let me know if you need any more help!
Good Luck,
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