Themes, topics - math word problems - page 90 of 174

Number of problems found: 3474

Transformer oil temperature
The transformer is oil-cooled and transforms a power of 20 MW with an efficiency of 92%. Determine the temperature of the oil at the outlet of the transformer if the oil was 20 °C when it entered the transformer. 2.5 liters of oil will flow through the tr
Horse hay calculation
Nine horses need a lot of hay for two days. How many horses would the same amount of hay be enough for three days?
Checkout waiting time
When only three checkouts are open in a supermarket, people wait in line for an average of 10 minutes. How many minutes will the average waiting time in line be if two more checkouts open?
Outside tangents
Calculate the length of the line segment S₁S₂ if the circles k₁ (S₁, 8 cm) and k2 (S₂,4 cm) touch the outside.
Submarine pressure calculation
The submarine is at a depth of 50 m below the concave surface of the sea. Find the hydrostatic compressive strength of seawater on a metal cover with an area of 0.6 m².
The freezer
1. The temperature inside a freezer is minus 23 degrees Celsius. The temperature falls by a further 12 degrees Celsius. What is the new temperature? 2. What is the difference between temperatures of 12 degrees Celsius and 210 degrees Celsius?
Temperature conversion calculation
When converting degrees Celsius (C) to degrees Fahrenheit (F), the relationship is used: F = C . 9/5 + 32. How many degrees Celsius are they in New York City if the thermometer reads 23 degrees Fahrenheit?
Roofer work completion
Two roofers were to cover the roof in 14 days. After five days, they added one roofer. How long will it take them to complete the work? How many days will it take them to cover?
Tractor plowing calculation
Two tractors are working on plowing the field. If only the first tractor plowed, it would plow the field in 3 hours. The second tractor would plow the field by itself in 6 hours. How long will it take to plow if they work together, but the other starts wo
Inspector passenger calculation
Five inspectors will catch an average of 70 black passengers in 6 days. How many black passengers are caught by nine inspectors in 10 days?
Resistor resistance calculation
At a certain point, we measured a voltage of 3.74 V at a current of 170 mA at the terminals of a resistor connected to an electrical circuit. Calculate the resistance of the resistor.
Harvester calculation time
During the harvest, farmers had three combine harvesters available, with which they could harvest the fields in 9 hours. How long will it take if two additional harvesters arrive from a neighbouring farm to help?
Solution mixing calculation
How many grams of 80% solution and 55% solution do we need to mix to obtain 100 grams of 60% solution?
Heating element power
A heating element with a resistance of 1.6 Ω is used to heat the car's rear glass. The body is connected to the battery in the car, which has a voltage of 12 V. a) What is the power input of the heating element? b) How much heat does the heating element g
Superman car speed
Superman has a jet car that drives at 720 km/h. How many seconds will he reach the villain, who is 1600 m away?
Average speed
A car traveled from city A to city B at a speed of 40 km/h, then from B to C at 60 km/h, and finally from C to D at 50 km/h. Calculate the car's average speed over the entire route from A to D if the distance from A to B is 20% of the total distance and f
Resistor voltage calculation
The resistor has a value of 50 ohms, and a current of 120 mA passes through it. What is the voltage across the resistor?
Average speed
The average speed of a good cyclist is 30 km/h. The average speed of the less able is 20 km/h. They both set off on the same route at the same time. A good cyclist drove it 2 hours earlier. How long was the route?
Mushroom drying calculation
When dried, mushrooms lose 80% of their weight. How many fresh mushrooms do we need to get half a kilogram of dried ones?
Resistor resistance calculation
A current of 20 mA passes through the resistor, which is connected to a voltage of 2.5 V. What is the resistance of the resistor?

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