A child buy 18 pencil and pay 100 rs. He pay 1 rs more for white pencil than brown pencil. How many white pencil He buy? and what is price of one white pencil	Select the correct option
A) 4 B) 5 C) 6 D) 7 E) 8
LET white pencil be x and brown be 18-x   let 1 brown pencil be y rs.   so, x(y+1)+(18-x)y=100   =&gt;xy+x+18y-xy=100   =&gt;x+18y=100   x=10 y=5   ans : 6   ANSWER:6
<result>C</result>
A child buy 18 pencil and pay 100 rs. He pay 1 rs more for white pencil than brown pencil. How many white pencil He buy? and what is price of one white pencil