SOLUTION: There is an archery competition. All participating archers will shoot 20 times. 10 points will be awarded for each successful shot, where 15 points are deducted for each miss. One

Question 681901: There is an archery competition. All participating archers will shoot 20 times. 10 points will be awarded for each successful shot, where 15 points are deducted for each miss. One of the archers gets 100 points. How many successful shots did he make?
Answer by ReadingBoosters(3246) (Show Source): You can put this solution on YOUR website!
x is successful shots
y is missed shots
...
x+y=20 : rearrange as x = 20-y
10x-15y=100
...
solve for x
10(20-y)-15y = 100
200 - 10y - 15y = 100
-10y-15y = 100 - 200
-25y = -100
y = 4
...
x=20-4=
.....................
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