# Numbers - math word problems

1. ABS CN Calculate the absolute value of complex number -15-29i.
2. Number Calculate the integer number which, divided by 34 gives 10 and the rest 25.
3. Geometric 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. Father and son Father and son are together 80 years. Son is 28 years younger than father. How old is the son?
5. Trio 56 children lined up in groups of three. How many children did not create a trio?
6. Exponential equation Solve exponential equation (in real numbers): 98x-2=9
7. Discounts on rail (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 Solve equation: log33(3x + 21) = 0
9. Two doctors 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 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 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 The farmer farming 293 ha of arable land and the remaining 20% are meadows and pastures. How much land farmer owns? 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. Chickens and rabbits In the yard were chickens and rabbits. Together they had 14 heads and 44 legs. How many chickens and how many rabbits was in the yard?
15. Percentages and numbers How many percent is number 426 greater than number 71?
16. Pension or fraud 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 About what percentage price of car increased if price rose from €1880 to €2200?
18. Acid 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 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 How many times must throw the dice, the probability of throwing at least one six was greater than 90%?

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