Question

Bobby wants to go on a school trip that will cost him $250. He comes up with an equation that represents how much he needs to save each week as follows: 25w+30=250, where W is the number of week spent saving.

If he has 9 weeks to save will you have enough money to go on the trip? Explain.

Answer 1

Yes, Bobby will have enough money if he saves for 9 weeks. You can find this through either substituting w for 9 in the equation, or solving the equation itself.

Substituting:


`25(9)+30`
Substitute w for 9.


`225+30`
Simplify.


`225+30=255`
Solve.

255 is greater than 250, so yes, he will have enough money saved.


Solving the equation:


`25w+30=250`
Original Equation


`25w=220`
Subtract 30 from both sides.


`w=8.8`
Divide both sides by 25.

The number of weeks he needs is 8.8. When rounding it up, you get 9.