Mistake

Nicol mistake when calculate in school. Instead of add number 20 subtract it.

What is the difference between the result and the right result?

Result

x =  -40

Solution:

Solution in text x =







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. I think number
    hats I think number.When I add 841 to it and subtract 157, I get a number that is 22 greater than 996. What number I thinking?
  2. Flood water
    flooding Flood waters in some US village meant that the homes had to evacuate 364 people. 50 of them stayed at elementary schools, 59 them slept with their friends and others went to relatives. How many people have gone to relatives?
  3. Roman numerals 2-
    rome-italy_2 Subtract up the number written in Roman numerals. Write the results as Roman numbers.
  4. What is missing (1000)
    red_minus What number is to add to get 1000?
  5. Roman numerals 2+
    rome-italy_1 Add up the number writtens in Roman numerals. Write the results as a roman numbers.
  6. Roman numerals +
    rome-italy Add up the number writtens in Roman numerals. Write the results as a decimal number.
  7. Seven times
    numberline_12 Which number seven times is just as higher as 27, how much is smaller than 29?
  8. Number unknown
    plusminus_3 Adela thought the two-digit number, she added it to its ten times and got 407. What number does she think?
  9. Integers
    calculator_mechanical May be the sum of two integers less than their difference?
  10. Voting
    vote_2 400 employees cast their votes in a board member election that has only 2 candidates. 120 people vote for candidate A, while half of the remaining voters abstain. How many votes does candidate B receive?
  11. Write decimals
    numbers_34 Write in the decimal system the short and advanced form of these numbers: a) four thousand seventy-nine b) five hundred and one thousand six hundred and ten c) nine million twenty-six
  12. Two numbers 6
    numbers_49 Fill two natural numbers a, b: 7 + blank- blank = 5
  13. Roman numerals
    roman_1 Write numbers written in Roman numerals as decimal.
  14. Summand
    plus One of the summands is 145. The second is 10 more. Determine the sum of the summands.
  15. Drive
    school-bus At the bus stop 8 people take out and 10 people take into bus. Next stop 6 take out and 5 take in. On the third stop 6 take out and 3 take in. The bus traveled further with 39 people. How many passengers were originally at the bus?
  16. Eq1
    eq1_3 Solve equation: 4(a-3)=3(2a-5)
  17. If-then equation
    triangles_10 If 5x - 17 = -x + 7, then x =