What was the original number
Sam thinks of a number. He doubles it, then adds 7. After that, he divides the result by 3 and gets 11.
What was Sam’s original number?
A box of biscuits
A box of biscuits contains 36 biscuits. 20 biscuits have foil wrappers. 15 are chocolate biscuits with foil wrappers. If 9 are not chocolate and do not have a foil wrapper, then how many chocolate biscuits are there?
Let Sam’s original number be x.
ReplyDeleteHe doubles it:
2x
Then adds 7:
2x + 7
Divides the result by 3 and gets 11:
(2x + 7) ÷ 3 = 11
Now, solve for x:
2x + 7 = 11 × 3
2x + 7 = 33
2x = 33 - 7
2x = 26
x = 26 ÷ 2
x = 13
Final Answer:
Sam’s original number was 13.