# Mailbox

Mailbox is opening at regular intervals 3 times a day. The first time is opened at 8:00 and the last at 19:00. Calculate hours when mailbox is opened during day.

**Result****Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):**

**Showing 0 comments:**

**Be the first to comment!**

#### To solve this example are needed these knowledge from mathematics:

## Next similar examples:

- Tram lines

Trams of five lines driven at intervals of 5,8,10,12 and 15 minutes. At 12 o'clock come out of the station at the same time. About how many hours again all meet? How many times have earch tram pass for this stop? - Timeage

Seven times of my age is 8 less than the largest two-digit number. How old I am? - Runners

For three runners (on the first to third place) is prepared 30 chocolate that they be distributed in the ratio of 3 : 2 : 1 How much chocolate will get everyone? - Pills

If it takes 20 minutes to run a batch of 100 pills how many minutes would it take to run a batch of 50 pills - Michal

Michal has 2.90 per hour. How much does he earn during the week of the summer job? - Fan

The fan has a speed of 210 RPM. Calculate for time of one fan period. - Masons

1 mason casts 30.8 meters square in 8 hours. How long casts 4 masons 178 meters square? - Chocolate

I eat 24 chocolate in 10 days. How many chocolate I eat in 15 days at the same pace? - Bed time

Tiffany was 5 years old; her week night bedtime grew by ¼ hour each year. If, at age 18, her curfew time is 11pm, what was her bed time when she was 5 years old? - How old

The student who asked how many years he answered: "After 10 years I will be twice as old than as I was four years ago. How old is student? - Average

The arithmetic mean of the two numbers is 71.7. One number is 5. Calculate the second number. - Motor oil

30 liters of oil cost 28.80 Euros. How much cost a liter? - Customer

A customer purchase three (3) writing pads from a store. She receive k9.70 change from a k10.00 note . How much was it's writing pad cost? - Report 2

A School reports students to teacher ratio of 6:1. If there are 45 teachers in the School, how many students are there? - Date game

Let now is Wednesday. What day is after 248 days? Write the result as a number: 1=Monday, 2=Tuesday, 3=Wednesday, 4=Thursday, 5=Friday, 6=Saturday, 7=Sunday? - Round it

0.728 round to units, tenths, hundredths. - Withdrawal

If I withdrew 2/5 of my total savings and spent 7/10 of that amount. What fraction do I have in left in my savings?