Number

Determine unknown number if you know that difference between five times and triple of number is 42.

Result

x =  21

Solution:


5x-3x = 42

2x = 42

x = 21

Calculated by our simple equation calculator.







Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Showing 0 comments:
1st comment
Be the first to comment!
avatar




To solve this example are needed these knowledge from mathematics:

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. Street numbers
    street Lada came to aunt. On the way he noticed that the houses on the left side of the street have odd numbers on the right side and even numbers. The street where he lives aunt, there are 5 houses with an even number, which contains at least one digit number 6.
  2. Addition of Roman numbers
    roman Added together and write as decimal number: XXXIV + MDCCXII
  3. Valid number
    numbers Round the 453874528 on 2 significant numbers.
  4. Father and son
    father_son_1 Father is 44 years old, his son 16 years. Determine how many years ago was the father five times older than the son.
  5. Forest nursery
    stromcek_2 In the forest nursery after winter, they found that 1/10 stems died out of them. For them, they land 193 new spruces. How many spruces are in the forest nursery?
  6. If-then equation
    triangles_10 If 5x - 17 = -x + 7, then x =
  7. Eq1
    eq1_3 Solve equation: 4(a-3)=3(2a-5)
  8. Benches
    garden_13 The park has 64 benches. Occupied are by 18 more than empty. How many benches are occupied and empty ?
  9. Jan and Dan
    skolske-zosity Jan and Dan had the same money. Jan bought 5 workbooks and left him 15 CZK. Dan 6 and left him nothing. How much money have in total?
  10. Jam cakes
    buchty Mom baked a third of plum jam cakes, one third cheesecakes and 18 poppy. How many cakes she had bake?
  11. Cookies
    koláčky Mom bake cookies. Rolo took 2/9 of all cookies, Michal 3/9. How many cookies ate Rolo if Michal had 9.
  12. Cakes
    buhty_1 1/3 poppy cake, 1/3 apple, 15 pieces of cheese. How many are totally cakes?
  13. Apples 3
    apple Julka has 5 apples more than Hugo and four apples less than Annie. Hugo has 17 apples. How many apples has Julka and how Annie?
  14. Temperature 2
    teplomer_4 Sunday's high temperature was 3 degrees higher than Saturday's. On Monday, the temperature fell 5 degrees, then rose 7 degrees on Tuesday and 4 more on Wednesday. Then it fell 17 degrees to a record low of 31 on Thursday. What was the temperature on Saturd
  15. Popsicles
    nanuky Francis went to buy ice lollies. If he buy 8 popsicles he missed 4 USD. When he buy 7 popsicles, got back 1 USD. How many USD was a popsicle?
  16. Equation 20
    eq222_21 In given equation: 8/9-4/5=2/9+x, find x
  17. One frame
    room_1 5 picture frames cost € 12 more than three frames. How much cost one frame?