
The Code of Three
Decode or be locked out! Can you do math?
Simple equations ยท Class 7

The Code of Three
Decode or be locked out! Can you do math?
Numberland. Momo unlocks the chest.
Momo: Unlock the chest! It's a simple code.
Professor Puzzle: Oh, a simple code? That's easy for me!
Momo: Three times a number plus five equals twenty. Can I figure it out?
The magic of numbers
Secret number, do magic sums.
Find it, solve the puzzle.
Treasure hunt, answer known.
Momo: I love puzzles! Let's find the secret number! It's like a game!
Professor Puzzle: Let's say x is five. Then 3*5+5=20, right?
Momo: Let's try one! 3 times a number plus 5 equals 20.
20 - 5 = 15.
Then, we divide 15 by 3: 15 รท 3 = 5.
So, the secret number is 5!
Momo's secret
First, undo what the villain did.
Divide for the secret.
It's like unwrapping a present!
Momo: Unwrap the present by undoing and dividing. It's simple!
Your turn, hero!

Three times a number plus six equals twenty-one. What's the number?
5. 3x + 6 = 21 โ 3x = 15 โ x = 5. 5
Professor Puzzle: Wrong! Try x is four. Then 3*4+5=17. Not twenty!
Twice a number minus six equals ten.
8. 2n - 6 = 10; 2n = 16; n = 8. 2 ร 8 - 6 = 10.
The final battle

Professor Puzzle says: Twice a number plus three equals fifteen. What is the number?
6. 15 - 3 = 12, then 12 รท 2 = 6.
Professor Puzzle: You're stuck! Now, divide and take away five.
Momo: Twenty minus five is fifteen. Fifteen รท 3 = 5. The code is 5!
The chest opens. Momo smiles. All is well.
The End?

Villain card won! Answer again in a few days and it turns gold.
Remember
But what's next? A secret note falls from the chest, with a question for Momo.
A comic book about Simple equations. Follow Momo, learn the idea, and answer three questions to beat Professor Puzzle.