Valerie buys 3 new dresses on average every year for the last 5 years. In order to increase her average to 4 dresses per year, how many dresses should Valerie buy next year? Answers.
A) 1	B) 5	C) 6	D) 9	E) 12
Solution   Average of 6 years = 4 .   âˆ´ Required number of dresses= (6x4)-(5x3)   = 24- 15= 
<gadget id="calculator">24- 15</gadget>
<output>9</output>
9.   Answer 9
<result>D</result>
Valerie buys 3 new dresses on average every year for the last 5 years. In order to increase her average to 4 dresses per year, how many dresses should Valerie buy next year?