Tom bought 9 new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now only 28 cards left. How many cards did Tom start with ?

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Tom bought 9 new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now only 28 cards left. How many cards did Tom start with ?

75

Step-by-step explanation:

Let x be the number of cards he had at first.

He bought 9 new cards:

x + 9

His dog ate half (Which means he also had half left)

0.5(x+9)

There are 38 cards left:

0.5(x+9) = 38

0.5x + 4.5 = 38

0.5x = 38 - 4.5

0.5x = 33.5

x = 33.5 ÷ 0.5

x = 67

So Sam had 67 cards to start off with.

Note: You may want to write 0.5 as half (1/2) .. it is just clumsy to type that, so I kept it as decimal.

Thirty five point five, but you cannot have half a card so you have to round it which gives you thirty six.

Answer= 36

Tom started with 47 cards

28+28=56

9 are new so 56 - 9 = 47 which is your answer

20+5+25=50I think that will work

49, because if he bought 9 you need to add that to 40 to get the whole

Tom started with 47 cards.

He had 28 left. If his dog ate half then multiply 28 by 2

You get 56

Out of those 56 cards, 9 of them are new

So subtract 9 from 56

You get 47