Question

On my 30th birthday, I plan to light 30 candles on my cake and blow 30% of them. How many candles will stay lit after I'm done?

Answer 1

You can set up an proportion like this:

———- = ————
You can use this way for future questions.

On the left denominator/bottom, place 100, as for percents it will always be 100. On the right denominator, place 30/ the whole. On the right numerator/top, place an x, as the part is unknown. On the right numerator, place 30%/The percent.
You multiply across, then divide what’s left over.
1) multiply: 30 candles x 30 = 900
2) divide: 900/100= 9

After you blow 30% of your 39 candles, you will have 9 candles that are still lit.

Answer 2

30 candles=100%

30% of 100%= 9 candles out of 100 candles

after blowing out 30% of the candles, 9 should be left lit.