Numbers - math word problems

  1. ABS CN
    complex_num Calculate the absolute value of complex number -15-29i.
  2. Number
    fractions_1 Calculate the integer number which, divided by 34 gives 10 and the rest 25.
  3. Geometric mean
    geom_mean Calculate the geometric mean of numbers a=15.2 and b=25.6. Determine the mean by construction where a and b are the length of the lines.
  4. Trio
    3Soldiers 56 children lined up in groups of three. How many children did not create a trio?
  5. Father and son
    father_son Father and son are together 80 years. Son is 28 years younger than father. How old is the son?
  6. Exponential equation
    exp Solve exponential equation (in real numbers): 98x-2=9
  7. Discounts on rail (ZSSK)
    preukazy_zssk The railway company ZSSK offers a discount of 15% (REGIONAL) for 5 Eur/year. Calculate the real discount rate as a percentage, where passengers will travel 19 Eur per week.
  8. Logarithmic equation
    nat_log_ln Solve equation: log33(3x + 21) = 0
  9. Two doctors
    dr_cvach Doctor A will determine the correct diagnosis with a probability 93% and doctor B with a probability 79%. Calculate probability of correct diagnosis if patient is diagnosed by both doctors.
  10. Monkey
    monkey Monkey fell in 40 meters deep well. Every day it climbs 3 meters, at night it dropped back by 2 m. On what day it gets out from the well?
  11. Inflation
    tsar Once upon a time, tsar owned a money printer and printed and printed. The result of printing money prices went up,in the first year 3.9 %, in the second 6%, in the third 4.7% and in the fourth 5.5%. Then tsar was failed in election. Calculate the ave
  12. Farmer
    krava The farmer farming 293 ha of arable land and the remaining 20% are meadows and pastures. How much land farmer owns?
  13. Ladislav in Amsterdam
    jakob3 Ladislav was reward and went to conference in Amsterdam. Conferense fee was € 3484. Calculate how many books Ladislav could buy at the price of 48 and 52 euros if he don't want fill whole home library and he can buy only 70 books?
  14. Percentages and numbers
    20_percent How many percent is number 426 greater than number 71?
  15. Chickens and rabbits
    pipky In the yard were chickens and rabbits. Together they had 28 heads and 78 legs. How many chickens and how many rabbits was in the yard?
  16. Pension or fraud
    dochodca_icon Imagine that your entire working life working honestly and pay taxes and to Social Insurance (in Slovakia). You have a gross wage 730 Euros, you pay social insurance (you and your employer) monthly € 263 during 44 years and your retirement is 354 Eur
  17. Car inflation
    car_1 About what percentage price of car increased if price rose from €1880 to €2200?
  18. Acid
    acid_1 The barrel is 199 litres of 38% acid. How many percent acid occurs when 61 litres revoke and replace it with the same amount of water?
  19. Report card
    vysvedcenie_1 Ivor hit 4× grade 5 at the beginning of the school year. How many times must now catch grade 1 to get grade 2 on the report card?
  20. Dice
    dices How many times must throw the dice, the probability of throwing at least one six was greater than 90%?

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