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  1. , and x=2, y=5 find z
  2. Solve: x+y=10, y+z=12, x+z=14,find x , y , z 
  3. If x+y+z=21 and x=y=z, find the value of each variable.
  4. x−y+z=4, x=5, y=3, find .
  5. , x=y+1, z=x−2, find x , y ,z
  6. The sum of three numbers is 60. The first is twice the second, and the third is 4 more than the second. Find all three.
  7. Sam, Ali, and Ben scored a total of 180 marks. Sam scored 10 more than Ali, and Ben scored twice what Ali scored. Find their marks.
  8. Three numbers add up to 36. The first is 2 more than the second. The third is 4 less than the first. Find the numbers.
  9. A triangle has angles x, y, and z. If all angles add up to 180°, and x=y, z=2x, , find each angle.
  10. , x=z+3, y=z−2, find x ,y, z
  11. x+2y+3z=20 , y=2 , z=3z  find x.
  12. The sum of ages of three siblings is 45. The oldest is twice the youngest, and the middle one is 5 years older than the youngest.

  13. A farmer has 30 animals (x cows, y goats, z chickens). Cows + Goats = 18, Goats + Chickens = 20. How many animals of each kind?

  14. In a box, there are x red, y blue, and z green marbles. Total is 50. Red = Blue, Green = Red + 10. Find x, y, z.

  15. A student has x math books, y science books, and z story books. Total books = 40. Science books are double math books. Story books are 4 less than science books.

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