- Decide what stands for, and write it down.
- Express everything else using .
- Write the equation from the sentence that says what's equal.
- Solve, then check it against the story.
Work through it
Three consecutive integers add up to 72. Find them.
Let them be , , .
, so .
They're 23, 24 and 25. Check: .
Plan A costs $20 plus $3 per hour. Plan B costs $5 per hour. When do they cost the same?
, so hours.
A rectangle is 4 cm longer than it is wide, and its perimeter is 40 cm.
Width , length .
, so .
It's 8 cm by 12 cm.
Watch out for this
Stopping at when the question asks for the largest number.
Reread the question. was only the smallest. The answer is 25.
Your turn
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