Question

You're planning to buy a boat, a motor, and some miscellaneous boating equipment. The boat is $325, the motor costs $225, and the equipment costs $79. If you've saved $438 toward these how much more do you need to save?

Answer 1

You need to save `$191` more.

Explanation:

First find your total costs

`color(white)(mm)` `$325` . . . . Boat
`color(white)(mm)` `$225` . . . . Motor
+`color(white)(nn)` `$   79` . . . . Equipment
`color(white)((m)`―――
`color(white)(mm)` `$629` . . . . Total costs

Now find the difference between costs and savings

Total costs . . . . . . . `$629`
Minus savings . . `- $438`
`color(white)((mmmmmmm.)`―――
Amount needed . . .`$191` `larr` answer

`color(white)((mmmmmm)`―――――――

Check

Your savings plus the amount you still need should add up to the total costs.

Total costs

Boat . . . . . . . . . . . . $ 325
Motor . . . . . . . . . . ..$ 225
Equipment . . . . . . .$   79
`color(white)((mm..mmmm)`――――
Amount needed . . `$ 629`  ✓

`color(white)((mmmmmm)`―――――――
Total needed

Amount saved . . . .$ 438
Still needed . . . . . . $ 191
`color(white)((mmm.mmmm)`――――
Amount needed . . `$ 629`  ✓

`Check`