Ratio + rational numbers - math problems

Number of problems found: 37

Ratio
Increase in the ratio 20:4 number 18.5.
Ratio v2
Decrease in the ratio 12:16 number 13.2.
Ratio - proportion
Reduce the number 16 in proportion 3:2 5:4 11:8
One sixth
How many sixths are two thirds?
Percentages and numbers
How many percent is number 69 smaller than number 276?
Bureaucracy
The office was attended by 23 people. 9 of them completed the questionnaire. What is the percentage of all people?
Efficiency
A certain device consumes 28 kW and delivers 14 kW. Find its efficiency.
Discount
Product has been discounted twice by 19%. What is the total discount given?
Book
Calculate the thickness of the page of the collection of examples from mathematics, where 4.87 cm thick and has 451 pages.
Three co-owners
The three co-owners of building company have earnings from a contract portioned in the ratio of 3:6:7. Each of them received the amount in whole USD. One of them on contract earned 86450 USD. What was the total earnings this order?
Server
Calculate how many average minutes a year is a webserver is unavailable, the availability is 99.99%.
Expansion
If one side of the rectangle is larger 4-times and second 2-times, what percentage increases the area of rectangle?
School trip
School trip cost 247.2 Eur for one class (24 students). How much would cost a trip for two classes? (both classes together have 53 students)
Bonus
The gross wage was 1323 USD including 25% bonus. How many USD were bonuses?
Arble bag
A marble bag sold by Rachel's Marble Company contains 5 orange marbles for every 6 green marbles. If a bag has 35 orange marbles, how many green marbles does it contain?
VAT
John paid 1000 Euros in store for purchase. Calculate value added tax (VAT), which paid in purchase, if the VAT rate is 20%.
Tape
Video is 153% more expensive than tape recorder. How many percent is tape recorder less expensive than video?
Tare
Gross weight of shipment is 6927 kg and its tare is 7%. Calculate the net weight of the shipment.
Daily average
Calculate the average temperature during the day, when 15 hours were 20 °C and 9 hours was 13 °C.
Discounts on rail (ZSSK)
The railway company ZSSK offers a discount of 15% (REGIONAL) for 5 Eur/year. Calculate the real discount rate as a percentage, where passengers will travel 19 Eur per week.