A student chose a number, multiplied it by 2, then subtracted 138 from the result and got 102. What was the number he chose? Choose the correct answer:
A) 90
B) 100
C) 120
D) 160
E) 200
Solution:   Let x be the number he chose, then   2*x*138=102   2x=240   x=120   correct answer 120
<result>C</result>
A student chose a number, multiplied it by 2, then subtracted 138 from the result and got 102. What was the number he chose?