# Reason + expression of a variable from the formula - math problems

#### Number of problems found: 68

• Billiard balls
A layer of ivory billiard balls of radius 6.35 cm is in the form of a square. The balls are arranged so that each ball is tangent to every one adjacent to it. In the spaces between sets of 4 adjacent balls other balls rest, equal in size to the original.
• Four swords
Obelix has three helmets, four swords, and five shields. How many words must make at the blacksmith forge Metallurgix to be able to walk another 90 days in unique armor?
• Chairs
Determine the number of seats in the seventh row and ninth row, if the 3rd row has 14 seats and in every next row of seats has five more than the previous row.
• Cuboid and ratio
Cuboid has dimensions in ratio 1:2:6 and the surface area of the cuboid is 1000 dm2. Calculate the volume of the cuboid.
• Carpet
The room is 10 x 5 meters. You have the role of carpet width of 1 meter. Make rectangular cut of roll that piece of carpet will be longest possible and it fit into the room. How long is a piece of carpet? Note .: carpet will not be parallel with the diago
• Disease
Farmers'cooperative had a supply of feed for 50 cows to 6 days. Cows got insidious disease after 4 days, 10 of them died. How many total days that farmers had feed for cows?
• One and a half chicken
One and a half chicken bears one and a half eggs in one and a half-day. How many eggs can withstand from 6 chicken in 6 days?
• Two cars
Two cars started against each other at the same time to journey long 346 km. The first car went 53 km/h and the second 53 km/h. What distance will be between these cars 20 minutes before meet?

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Reason - math problems. Expression of a variable from the formula - math problems.