The energy-saver bulb uses 95 watts
Step-by-step explanation:
A regular light-bulb uses 20 watts less then twice the power of
an energy-saver light-bulb. The regular bulb uses 170 watts
We need to find how much the energy-saver bulb uses
∵ The energy-saver light-bulb uses x watts
∵ The regular light-bulb uses 20 watts less than twice the energy-sever
light-bulb
- Multiply x by 2 and subtract from the product 20
∴ The regular light-bulb uses = 2 x - 20
∵ The regular light-bulb uses 170 watts
- Equate the two expressions of the regular light-bulb
∴ 2 x - 20 = 170
- Add 20 to both sides
∴ 2 x = 190
- Divide both sides by 2
∴ x = 95 watts
The energy-saver bulb uses 95 watts
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