1. 1. I’m thinking of a number…
I think of a number, add 4, divide by 3, then multiply by 5. The final answer is 25.
What is my number?

2. Let x be my number.
5[(x + 4) ÷ 3] = 25
(x + 4) ÷3 = 5
x + 4 = 15
x = 11
My number is x = 11.

3. 2. Three friends have 200 cards between them.
Joe has 36 more cards than Chris.
Katy has twice as many cards
as Chris.
How many cards does each friend have?

4. Let the number of cards which Chris has be x.
Joe has x + 36 cards.
Katy has 2x cards.

5. The total number of cards
between them is:
Chris+Joe+Katy = 200
x + (x+ 36) + 2x = 200
4x + 36 = 200
4x = 164
x = 41

6. So,
Chris has… 41 cards
Joe has… 77 cards
Katy has… 82 cards.