Exam

1.- Find out the x in this proportion:               

2.-  The magnitudes side of a rectangle and its area have  ...

3.- If we have 1000 kg of food for cows, the magnitudes number of cows and days the food lasts have...

4.- If 7 kg of sweets costs 1.75 €, how much does 3 kg cost?

5.- If I travel at 50 Km/h, it takes 1 hour and 30 minutes to complete the trip. How long will it take if I travel at 75 km/h?

6.- In a central post office, 2 machines categorize 1.600 packages in 8 hours. How many machines will be needed to categorize 2.400 packages in 6 hours?       

7.- A suit that costs 100 €, had a 20% discount last month. This month they have increased the price by 20%. Now its price is

8.- A bank offers an interest rate of 2%. What interest will we obtain if we deposit 1200 € for 5 years?

9.- A grandfather decides to distribute 4.600 € between his three grandchildren, but instead of giving a third to each one he prefers to do it proportionally to the age of every grandchild, whose ages are 7,12 and 21 years old. How much will each of them receive?

10.- A grandfather decides to distribute 4.600 € between his three grandchildren, but instead of giving a third to each one he prefers to do it in an inverse proportional way to the age of every grandchild, whose ages are 7,12 and 21 years old. How much will each of them receive?