Father and son

Do you have a linear equation or system of equations and looking for its solution? Or do you have quadratic equation?

Next similar examples:

1. Six years
   In six years Jan will be twice as old as he was six years ago. How old is he?
2. Aunt
   Annie aunt is 35 years old, Annie is 14 years. For how many years will aunt have twice as many years as Annie?
3. Two looms
   On two different looms with different performance can be make required quantity of textile in 6 hours when both work together. On the first machine this quantity of the textile can make in 10 hours. How long should take make same quantity of textile on a s
4. The ship
   The ship went upstream speed of 20 km/h in relation to water. River flows at speed 10 km/h. After half an hour, he stopped and returned downstream to the starting point. How long it took way back when even if downstream speed of ship is 20 km/h in relation
5. 12 Moons
   Good Marry came to ask twelve moons for help with collecting strawberries. All twelve moons 1200 strawberries picked in 20 minutes. But lazy months July and August cease tear after 5 minutes. How many minutes in total will take collect strawberries?
6. Unknown number
   Identify unknown number which 1/5 is 40 greater than one tenth of that number.
7. Fifth of the number
   The fifth of the number is by 24 less than that number. What is the number?
8. Addends
   Number 118 divide into two addends, so first addend is 69 greater than 75% of the second addend.
9. Two tributaries
   Two tributaries of the pool fill it in 10 hours. One of the tributaries would fill 15 hours. How long would fill the first tributary?
10. Welders
    Welder do the job for six hours, the second one for 8 hours. How long do the job third welder if all together can do job in 2 hours?
11. Painters
    One painter could paint a school for 7 days. The second one for 6 days. It was necessary to paint the school in two days. Next painter was invited and all worked together. How long would this painter painted the school itself?
12. Workers 2
    Worker dug the trench for 7 hours, another worker for 10 hours. They recruited to work even one worker more. Digging should be done for 2 hours. For how long would dig third worker alone?
13. Collection
    John has collected half a bucket of raspberries in 45 minutes, Eva collects the whole bucket in an hour. How many minutes it would take to fill a bucket if the two children work together?
14. Candy
    Peter had a sachet of candy. He wanted to share with his friends. If he gave them 30 candies, he would have 62 candies. If he gave them 40 candies, he would miss 8 candies. How many friends did Peter have?
15. Equation
    Solve the equation: 1/2-2/8 = 1/10; Write the result as a decimal number.
16. Simple equation
    Solve for x: 3(x + 2) = x - 18
17. Percentage reduction
    Reducing the unknown number by 19% get number 700.7 Determine unknown number.