Question

A charity fair raised $6,000 by selling 500 lottery tickets. There were two types of lottery tickets: A tickets cost $10 each, and B tickets cost $60 each. How many tickets of each type were sold? 250, 250 315, 185 370, 230 410, 90 480, 20

Answer 1

x= A ticket 
y=b ticket
x+y=500
10x+60y=6000 
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   10x+60y=6000 
-  x+y=500 (*10) ---> 10x+10y=5000
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   10x+60y=6000
-  10x+10y=5000
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50y=1000
y=1000/50
y=20
b ticket =20

x+y=500
x+20=500
x=500-20
x=480
a ticket=480
 answer is the last option ,