50% of a number is 10 less than 3/5th of that number. What is the number?  Choose one
A) 100
B) 50
C) 150
D) 200
E) 75

Rationale: "let the number be x then , 3 x / 5 - ( 50 % of x ) = 10 3 x / 5 - 50 x / 100 = 10 x = 100 answer is a"
Answer: A