Inverse relationship - examples
A photocopier enlarges a picture in the ratio 7:4. How many times will a picture of size 6cm by 4cm be enlarged to fit on a 30cm by 20 cm page?
- Sequence 11
What is the nth term of this sequence 1,1/2,1/3,1/4,1/5 ?
Two hours 24 students harvested chestnuts on 36 acres. How many square meters harvested one student per hour?
Charlie bought 7 same chocolates for 14 Eur. How many euros he pay for 27 chocolates?
4 chickens give 4 eggs in 4 days. How many eggs can give 8 chickens for 8 days?
Same type of medicament produces a number of manufacturers in a variety of packages with different content of active substance. Pack 1: includes 60 pills of 1200 mg of active substance per pack cost 18 Eur. Pack 2: includes 30 pills of 1000 mg of active s
Increasing the minimum wage while maintaining the other parameters of the system, unemployment will be:
Two workers would make installation of greenhouses for 54 hours. For how many hours does the installation 9 workers?
- Painter Pavel
Painter Pavel painted the fence for 20 hours and painter Petr the same fence painted for 17 h. How long should take painted the fence together?
Two cats caught two mice in two days. How many mouses will catch 6 cats for 6 days?
Fields go plow two tractors with various performance. The first tractor plow whole field in 5 hours, the second tractor plow whole field 5 hours longer. How long take plow whole field with two tractors?
- Road repair
Road repair took 16 days for 34 workers if they worked 6 hours a day. How many days take repair same road 33 workers if they work 6 per day?
Mr. Radoslav calculated that excavation for a water connection dig for 10 days. His friend would take 7 days. Radoslav worked 3 days alone. Then his friend came to help and started on the other end. On what day since the beginning of excavation they met?
- Shadow and light
Nine meters height poplar tree has a shadow 16.2 meters long. How long shadow have at the same time Joe if he is 1,4m tall?
Three copiers will do the same in an hour k copies. How many copies would be done in an hour by four such copiers? ?
- Working time - shortening
The media often speculates about the change (especially to shorten) the working time of the five-day eight-hour working week to another working model. Calculate how many hours a day the employee would have to work a day at 6-day work week if he must work t
- Liquid soap
Three-member family enough liter of liquid soap for 15 days. After how many days the amount consumed when at the holidays come to us two cousins.
The lorry was loaded with 27 boxes of 24 kg. How many boxes with weight 36 kg can be loaded, if total load must be same?
It is true (prove it) that if a> b> 0: ?
Water pipe has a cross-section 1420 cm2. An hour has passed 831 m3 of water. How much water flows through the pipe with cross-section 300 cm2 per 8 hours if water flow same speed?