# Ratio - math word problems

On solving problems and tasks proportionally, we recommend a hint rule of three. Rule of three (proportionality) helps solve examples of direct and inverse proportionality. Three members make it possible to calculate the fourth - unknown member.#### Number of problems found: 718

- Potatoes

Potatoes contain 78.6% starch. How many potatoes need to obtain 27 kg of starch? - Map

Forest has an area of 36 ha. How much area is occupied by forest on the map at scale 1:500? - Inflation

What is better for people (employees)? ... - Pipeline

How much percent has changed (reduced) area of the pipe cross-section if circular shape changed to square with the same perimeter? - Money

Everyone complains about the lack of money. In fact, there is no shortage of money, but the relative scarcity of goods and things that people buy for the money. Calculate what percentage of the price of all goods and services rose immediately, if everyone - Pumps

The tank is filled with two pumps in 16 minutes. The first pump is filled in 30 minutes earlier than two one. How many minutes is filled with the first pump? - Ratio v2

Decrease in the ratio 12:16 number 13.2. - Ratio

Increase in the ratio 20:4 number 18.5. - Pipes

The water pipe has a cross-section 1087 cm². An hour has passed 960 m³ of water. How much water flows through the pipe with cross-section 300 cm² per 9 hours if water flows the same speed? - Gear wheels

Two gear wheels, which fit together, have the number of teeth z_{1}=58 and z_{2}=149. Calculate the speed of the first wheel, if the second wheel rotates 1232 revolutions per minute. - Minute angle

Determine size of angle, which takes minute hand for 75 minutes. - Tree trunk

Calculate the average tree trunk with a circumference of 149 cm. - Train

The train passes part of the line for 95 minutes at speed 75 km/h. What speed would have to go to shorten the driving time of 20 minutes? - Sphere cuts

At what distance from the center intersects sphere with radius R = 91 plane, if the cut area and area of the main sphere circle is in ratio 3/6. - DIY press

Under socialism regime was in some socialist countries to own a typewriter requires special permission. That has hindered the spread of DIY literature (manually transcribed through carbon copy paper for typewriters). Calculate how many typewriters today c - Thrift woman

Calculate how long grandmother will save on new shoes priced 108 euros if save 3 Eur monthly. - Car range

Kia has an average diesel consumption of 3.9 liters per 100 kilometers. What is the range of the car for 179 euros if fuel costs 1.3 EUR/liter, if the tank has a volume of 55 liters? - Median

The median of the triangle NOP is away from vertex P 95 cm. Calculate the length of the median, which start at P. - Fuel consumption

Škoda car has an average diesel consumption of 5.9 liters per 100 kilometers. What is the car range for a full tank of volume 70 liters? - Forest nursery

In Forest nursery plant one pine to 1.9 m^{2}. Calculate how many plants are planting in area 362 acres.

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