# Fractions + direct relationship - math problems

#### Number of problems found: 72

• Change the numbers in the ratio
Change the numbers 29, 38, and 43 in a 3: 4 ratio.
• Unknown number 5
Daniel thinks an integer. When he change this number at a ratio of 2:5, he got the number 2.8. Determine what number think Daniel.
• Ratio
Write the ratio with other numbers so that the value is the same: 2: 9
• Land area
The land area of Asia and Africa are in a 3: 2 ratio, the European and African are is 1:3. What are the proportions of Asia, Africa, and Europe?
• Divide money
Divide 1200 USD at a ratio of 1:2:3:4:5:6:9:10
• Pumps 5
5 pump pumped in 3 hours 1800 hl of water. How many hectoliters of water pumped 4 equally powerful pumps in 6 hours?
• Grandmother's clocks
Grandmother's clock is late every hour by half a minute. Grandmother set the clock exactly at 8.00 am. How many hours will show after 24 hours?
• Scale of the map
Determine the map's scale, which is the actual distance of 120 km l represented by a segment long 6 cm.
• Cows
4 cows spent 16 bags of hay in 5 days. How many bags of hay sacks are needed for 5 cows for seven days?
• Jan
Jan is 13 years and Peter 21 years old. For how many years will their ages in the ratio of 7:9?
• Map 2
At what scale is made map if the distance 8.2 km corresponds on the map segment 5 cm long?
• Divers
20-member group of divers carries the air for 15 hours of diving. 4 members of the expedition sick or wasn't came. How many hours is sufficient air to other divers?
• Metallurgical enterprise
Metallurgical company daily produces 318 tons of cast iron. How many tons of coke it burns to melt cast iron when 10 tons of cast consumes 6 tons of coke?
Road repair took 10 days for 36 workers if they worked 9 hours a day. How many days take repair same road 37 workers if they work 8 per day?
• Forestry workers
In the forest is employed 56 laborers planting trees in nurseries. For 8 hour work day would end job in 37 days. After 16 days, 9 laborers go forth? How many days are needed to complete planting trees in nurseries by others if they work 10 hours a day?
• Bonus
The gross wage was 1323 USD including 25% bonus. How many USD were bonuses?
• Pediatrician
Pediatrician this month of 20 working days takes 8 days holidays. What is the probability that on Monday it will be at work?
• TV fail
The TV has after 10,000 hours average 35 failures. Determine the probability of TV failure after 400 hours of operation.
• Beer
After three 10° beers consumed in a short time, there is 5.6 g of alcohol in 6 kg adult human blood. How much is it per mille?
• Youth track
Youth track from Hronská Dúbrava to Banská Štiavnica which announced cancellation attracted considerable media attention and public opposition, has cost 6.3 euro per capita and revenue 13 cents per capita. Calculate the size of subsidies to a trip group o

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