Individual Price: A calculator and a battery together sell for $21. The price of

Question

Individual Price:A calculator and a battery together sell for $21. The price of thecalculator is $20 more than the price of the battery. Find theprice of the calculator and the price of the battery.

I know, the answer is $20.50 for thecalculator and $0.50 for the battery. I have one solution, but Iwould like to be sure of my solution. Could you give me your solution to get this answer?How did you do to get this answer? Individual Price:A calculator and a battery together sell for $21. The price of thecalculator is $20 more than the price of the battery. Find theprice of the calculator and the price of the battery.

I know, the answer is $20.50 for thecalculator and $0.50 for the battery. I have one solution, but Iwould like to be sure of my solution. Could you give me your solution to get this answer?How did you do to get this answer?

Explanation / Answer

Let x represent the price of the calculator and   let   y   represent the priceof the battery x + y = 21         and   x = y + 20   so, if we substitute for x in the first equation we get y + 20 + y = 21     thus, 2y + 20 =21    if we subtract 20 from both sides, 2y = 1     now we divide both sides by2    and we get    y =0.5   tus x = 20.5 Hence the price of the calculator is $ 20.50 and theprice of the battery is $0.50 hope this helps

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