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

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

Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

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.
RELATED QUESTIONS
An empty 5-gal water jug weighs 0.75lb.With 3 c of water inside,the jug weighs... (answered by rfer)
One jug holds 7/8 gallon of water. If a faucet can release 16 gallons in 8 minutes, how... (answered by Fombitz)
A water jug with a capacity of 20 gallons is 20 percent full. At the end of every third... (answered by greenestamps)
you pour 200ml of water into a litre jug. what percentage of the jug is... (answered by wilft1)
A jug filled with water weight 2kg 450g. When the jug is 1/5 filled with water, it... (answered by ikleyn)
The clubhouse has a water tank from which hikers fill their water jugs before walking the (answered by josgarithmetic)
An empty 5-gal water jug weighs 0.75 lb. with 3 c of water inside, the jug weighs 2.25... (answered by checkley77)
a cylinder has radius 6cm nd height 15cm. luigi has a jug containing 2litres of water he (answered by Timnewman)
Two hikers come to a fork in the trail and want to take different paths. They need to... (answered by solver91311)