Answer this question:Jenine can sharpen a pencil 5 times before it runs out. She needs to sharpen a pencil for every 1.5 hours of use. She already has ten pencils and needs to write for 105 hours. A new pencil costs $2. How much does she need to spend on more pencils to be able to write for 105 hours?
A pencil last 7.5 hours because 5 x 1.5 = 7.5. The pencils she has will last 75 hours because 10 x 7.5 = 75. She needs 30 more hours of writing because 105 - 75 = 30. She will need 4 more pencils to reach this because 30 / 7.5 = 4. She will spend $8 on pencils because 4 x 2 = 8.
The answer is 8.

Answer this question:Julia's internet speed is 20 MBps (megabytes per second). How many songs she can download in half an hour if the size per song is 5MB?
1 hour has 60 minutes, therefore 1 / 2 hour has 1 / 2 * 60 = 30 minutes. 1 minute has 60 seconds, therefore 30 minutes has 30 * 60 = 1800 seconds. If Julia's internet speed is 20MBps and each song has a size of 5MB, then it would take 5 / 20 = 1 / 4 seconds to download one song. If it takes 1 / 4 seconds to download 1 song, then in 1800 seconds, Julia could download 1800 / (1 / 4) = 1800 * 4 = 7200 songs.
The answer is 7200.

Answer this question:Jack and Jill are friends who borrow from each other often. Last week Jack borrowed $1200 from Jill, which he promised to pay back with an interest of 10%. How much will Jack pay back?
The interest on the loan is 0.1 * 1200 = $120. The total amount Jack needs to pay back is 1200 + 120 = 1320.
The answer is 1320.

Answer this question:A chocolate bar weighs 125 g. A shopkeeper has just received a 2 kilogram box of chocolate. How many bars does this represent?
We have 2 kg = 2 * 1000 = 2000 g. So, the number of bars of chocolate is 2000 / 125 = 16.
The answer is 16.