SOLUTION: Jackie fills a jug with water continuously. It takes her 2 minutes to fill up 50% of the empty space in the jug with water. After every 2 minutes, she puts a penny into a jar to ce
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Question 1143354: Jackie fills a jug with water continuously. It takes her 2 minutes to fill up 50% of the empty space in the jug with water. After every 2 minutes, she puts a penny into a jar to celebrate. How many pennies will she have in the jar at the instant the jug had less than 30 % empty Space left?
A)0
B)1
C)2
D)3 Found 2 solutions by josmiceli, greenestamps:Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! She has to fill per cent to
reach less than 30% left min
I get B)1 for answer
The only penny is after the 1st 2 min
Get another opinion, too
It takes her 2 minutes to fill the jar to 50%. 1 penny goes in the jar.
In the next two minutes, she fills half of the 50% that is left to fill; half of 50% is 25%, so the jar is 75% full. That means 25% is empty; which is less than 30%.
So the 2nd penny would have gone in the jar at the end of those 2 minutes, when the jug had 25% empty space left. That means that, at the instant the jug has less than 30% empty space left, there is only 1 penny in the jar.
ANSWER: 1 penny in the jar at the instant the jug has less than 30% empty space.
