Work - practice for 13 year olds - page 11 of 25
Number of problems found: 487
- Cooker
A current of 2A passes through the immersion cooker at a voltage of 230V. What work do the electric field forces do in 2 minutes? - Bricklayers
The first bricklayer would build a wall in 3 days, the second in 4 days. The first bricklayer worked alone for a day, then the second bricklayer came to his aid and finished the work together. How long did it take to build the wall? - Championships 21683
Before the World Water Polo Championships, it was necessary to fill the pool. The first pump would fill in 12 hours, the second in 15 hours, and if all three pumps were started simultaneously, they would fill the pool in 4 hours. How long would the pool b - Cardholders 21563
Two cardholders will build a tower of cards in 0.5 hours. In how many hours will five such a tower be built?
- Hectares of forest
Twelve workers plant 24 ha of forest in 6 days. How many days will 15 people and 12 people plant in the same area? - Powerful 20773
The 300 liters per minute water starts to flow into the empty pool. We will fill the pool in 5 hours. How long would it take to fill a pool with a more powerful 750L pump per minute? - Earnings 20763
Two workers worked on a joint task: One worked 36 hours and the other 40 hours. Earnings of 11400 are divided by the ratio of hours worked. How much did everyone get? - Apprentice 20753
The trained worker will do the work in 4 hours. The apprentice needs 6 hours for the same work. How many hours and minutes would they do this work if they worked together? - Roofers 20413
Three roofers put the roofing on the roof in 8 days. How long will it take to get two more after three days?
- Adjustment 20163
Two students adjust the flower bed in 3 hours. How long will this adjustment take for the pupils if they invite four helpers? - Horses 20063
Nine horses need a lot of hay for two days. How many horses would the same amount of hay be enough for three days? - Complete 19783
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? - Tractors 19713
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 - Neighboring 19293
Farmers had three harvesters at their disposal during the harvest, with which they would harvest the fields in 9 hours. How long will it take them if two more harvesters from the neighboring district come to help them?
- A lot of hay
Martin's grandfather weighed a lot of hay and calculated that for 15 rabbits, it last 100 days. How many days will this lot be enough for 25 rabbits? - Bricklayers 18773
According to the standard, we calculated that two masons would plaster the corridor of the new school building in 54 hours. How long would it take for nine bricklayers to plaster this corridor? - Fifteen 18403
Fifteen ants bring 10 g of food to the anthill in 1 hour. In how many hours will five ants carry 1 kg of food? - Produced 18213
In the factory, they produced 1,500 products a week on five machines. How many machines do they need to produce 2,000 products a week? - Double-performance 17931
Excavation work was carried out by nine double-performance machines, which excavated 420 meters of excavation in one day. How many were there if the more powerful machine excavated 420 meters in a week (7 days) and the less powerful engine excavated 280 m
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