Question 763364
x = 25c pieces
y = 10c pieces
x + y = 29...1
25x + 10y = 545...2
Multiply (1) by 25
25x + 25y = 725...3
25x + 10y = 545...2
Subtract (2) from (3)
      15y = 180
        y = 12
Substitute y = 12 into (1)
x + y = 29
x + 12 = 29
     x = 17
Therefore Tom has 17 x 25c pieces
and 12 x 10c pieces.
Hope this helps.
:-)