# Inverse relationship + direct relationship - practice problems

#### Number of problems found: 131

- Reading

If I read 15 pages a day, I will read the whole book in 18 days. How long will it take to read a book if I only read 9 pages every day? - Tennis balls

Can of tennis balls contains 3 balls per can and cost $7 how much will it cost for 36 tennis balls? - Coins

The money - coins are minted from the hardest bronze, which contains copper and tin in a ratio of 41: 9. How much copper and tin are in 2kg of bronze money? - Shoemaker

Both the shoemaker and his apprentice repaired his shoes. The apprentice worked for 6 days and repaired 10 pairs of shoes every day. The shoemaker did the same job in 4 days. How many pairs of shoes did the shoemaker repair per day? - Coils of transformer

The primary coil of the transformer has 400 turns, a current of 1.5 A passes through it and is connected to a voltage of 220 V. For the secondary coil, find the voltage, current, and a number of turns if the transformation ratio k = 0.1. - Book reading

Suzan reads a book. If she read half an hour a day, she would read it in nine days. How many minutes does he have to read a day if he wants to read it three days earlier? - Six workers

Six workers earned a total of CZK 12,600 per week on the construction site (5 working days). How much do 7 workers earn in 10 days with the same daily average salary? - Five combers

Five combers harvest 12 rows of strawberries in 4 hours. How many rows of strawberries will two combers harvest in 10 hours? - The farmer

The farmer calculated that the supply of fodder for his 20 cows was enough for 60 days. He decided to sell 2 cows and a third of the feed. How long will the feed for the rest of the peasant's herd last? - Plums

By drying 3 kg of fresh plums, we obtained 750 g of dried plums. How many kg of fresh plums need to be dried if we want to get 1.5 kg of dried plums? - A lot of hay

Martin's grandfather weighed a lot of hay and calculated that for 15 rabbits, it last in 100 days. How many days will this lot be enough for 25 rabbits? - Snack

CZK 450 was paid for a snack for 30 pupils. How many CZK will we pay for the same snack for 28 pupils? - Milk2cheese

From 40 liters of milk is produced 8 kg of cheese how many liters of milk are needed to produce 2 kg of cheese? - Worker's performance

15 workers paint 180 m fence in 3 days. In how many days will 9 workers paint a 360 m fence? We assume that each worker have the same, constant and unchangeable performance. - Fast tourists

If three tourists pass the route in 5 hours, how long will the same route take six equally fast tourists? - The bakery

The bakery baked 325 cakes from 25kg flour. How many kg of flour do they need to bake 195 pieces of such cakes? - Trio ratio

Hans, Alena, and Thomas have a total of 740 USD. Hans and Alena split in the ratio 5: 6 and Alena and Thomas in the ratio 4: 5. How much will everyone get? - Temporary workers

Three temporary workers work in the warehouse and unload the goods in 9 hours. At what time would five temporary workers unload the same products? - In the bakery

In 2.25 hours, 24 pieces of bread are baked in the bakery. How many breads are baked in the bakery in 6 hours and 45 minutes? - Eight masons

Eight masons will plaster a wall with an area of 1440 m² in 9 days. They work 8 hours a day. How much area will plaster 6 masons in 4 hours?

Do you have an exciting math question or word problem that you can't solve? Ask a question or post a math problem, and we can try to solve it.

Inverse relationship - practice problems. Direct relationship - practice problems.