Sam bought a boxes of chocolate
online postage was 9 and the total cost was $45 how much was each box?
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Answer:
Let's use x for the price of each box.
3 times x plus $9 is $45:
3x + 9 = 45
Let's solve!
Start with: 3x + 9 = 45
Subtract 9 from both sides: 3x + 9 − 9 = 45 − 9
Simplify: 3x = 36
Divide by 3: 3x /3 = 36 /3
Simplify: x = 12
So each box was $12
Advanced: we can also do the "divide by 3" first (but we must do it to all terms):
Start with: 3x + 9 = 45
Divide by 3: 3x/3 + 9/3 = 45/3
Simplify: x + 3 = 15
Subtract 3 from both sides: x + 3 − 3 = 15 − 3
Simplify: x = 12
Same answer!
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