Algebra - math word problems - page 290 of 305

Number of problems found: 6095

Natural number digits
There is no 0 in the decimal notation in natural numbers; there are even numbers or odd numbers, each at least once. Find the number of all k-digit natural numbers.
Vinegar mixture percentage
What percentage of vinegar do we get by mixing 2 liters of 8% vinegar with 3 liters of 4% vinegar?
Number divisibility puzzle
The number X is the smallest natural number whose half is divisible by three, a third is divisible by four, a quarter is divisible by eleven, and its half gives a remainder of 5 when divided by seven. Find this number.
Apple division
The three brothers had 24 apples. Everyone kept half and divided half between the two brothers. Everyone had as many apples as they had three years ago. How old were they?
Part-timers
Six part-timers would take seven hours to pick strawberries. How long would this work take if two more temporary workers were added after three hours?
Hydrogen peroxide solution
Prepare 250g of a 30% solution of hydrogen peroxide in water.
Blue rock solution
Prepare 100g of a 15% blue rock solution.
Reading
If I read 15 pages a day, I will read the whole book in 18 days. How long will it take to read a book if I only read nine pages every day?
Solutions, mixtures
We have 2 liters of 20% solution available. How much 70% solution do we need to add to get a 30% solution?
Lumberjacks
Fifteen lumberjacks would take 12 days to destroy the broken trees. How many days would this work require if the company added five workers to it after four days?
Crayon count
Michaella has five crayons. Victor has fewer of them than Michaella. Vendelín has as many as Michaella and Vojto have together. All three have seven times more crayons than Victor. How many crayons does Vendelín have?
40% volume
40% volume with 104 uph (units per labor hour) 8 people are working. What is the volume?
Solutions, mixtures
How many liters of 70% solution must we add to 5 liters of 30% solution to give us a 60% solution?
Mowing time
Three gardeners mow the meadow for a while. Four gardeners can do it half an hour earlier. How long will it take five gardeners to do it?
Tractors
Six tractors plowed the field for eight days. After two days, two tractors broke down. How many days were prolonged work in the field?
Painting
Joseph and Fero painted the bench for four hours. If four friends helped him, how many hours would it take him to work?
Five tractors
Five tractors plow the field in 4.8 hours. How long would it take to plow this field if, after 1.5 hours of work, two tractors went to a different field?
Interest
What is the annual interest rate on your account if we put 43280 and after 198 days received 44293.9?
Vinegar
We must dilute 36 liters of 9.1% aqueous vinegar to 4.5% one. How much water is necessary to add?
Star equation
Write digits instead of stars so that the sum of the written digits is odd and is true equality: 42 · ∗8 = 2 ∗∗∗

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