# Equation - examples - page 40

1. Raw meat
In the school cafeteria for one lunch, they prepare 490 servings of 50 g of boiled meat. Meat loses 30% of its weight by cooking. How many kilograms of raw meat must the school canteen prepare for this lunch to cook?
2. Coach
Average age of 24 players and a coach of one team is 24 years. The average age of players without a coach is 23 years. How old is the coach?
3. UN 1
If we add to an unknown number his quarter, we get 210. Identify unknown number.
4. Equation 11
Solve equation: ?
5. Unknown number
I think number. If subtract from the twelfth square the ninth square I get a number 27 times greater than the intended number. What is this unknown number?
6. Two lands
The common area of the two neighboring lands is 964 m2. The second land is 77 m2 smaller than twice the size of the first land. Find the areas of each land.
7. Three granaries
Three granaries hold 7,800 metric cent (q) of grain. In the first, 70 tonnes of grain was more than the second and in the third it was 120 tonnes less than in the second. How many grain were in each granary?
8. Years
Susan is 3 years and as she will be old as Teodor now him will be 11. How old is Teodor today?
9. King's birthday
To celebrate the king's birthday workers fire 1/5 all purchased rockets. To celebrate the Queen's birthday fire 1/6 of the remaining rockets and to celebrate the birthday of king's son remaining 15,000 rockets. How many rockets they purchased?
10. The gardener
The gardener bought trees for 960 CZK. If every tree were cheaper by 12 CZK, he would have gotten four more trees for the same money. How many trees did he buy?
11. Right triangle eq2
Find the lengths of the sides and the angles in the right triangle. Given area S = 210 and perimeter o = 70.
12. Difference AP 4
Calculate the difference of the AP if a1 = 0.5, a2 + a3 = -1.1
13. Combinations
If the number of elements increase by 3, it increases the number of combinations of the second class of these elements 5 times. How many are the elements?
14. Unknown number xyz
Find the number that its triple is 24. Solve by equation.
15. Proportion
write the following proportion 8 is to 64 as to 2 is to x
16. MO Z8-I-1 2018
Fero and David meet daily in the elevator. One morning they found that if they multiply their current age, they get 238. If they did the same after four years, this product would be 378. Determine the sum of the current ages of Fero and David.
17. Elements
If the number of elements is decreased by two the number of permutations is decreased 30 times. How many elements are?
18. Boys and girls
There are 28 girls in the hall. 5/7 of all children are boys. How many children and how many boys are there?
19. Savings 2
Jozef and Michael saved 46 euros together. Michael saved 22 euros more than Jozef. How much did save each of them?
20. Variation equation
Solve combinatorics equation: V(2, x+8)=72

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