GATE2012 CY: GA-10

Question

Raju has $14$ currency notes in his pocket consisting of only Rs. $20$ notes and Rs. $10$ notes. The total money value of the notes is Rs. $230$. The number of Rs. $10$ notes that Raju has is

• A.  $5$
• B.  $6$
• C.  $9$
• D.  $10$

Answer 1

No. of Rs 20 notes $- x$
No. of Rs 10 notes $- y$
Given,
$x+y=14$
$20x+10y=230$

Solving the two equations, we get.
$x=9, y=5$
So, the number of Rs. $10$ notes is $5.$

Answer A.

Answer 2

no . of notes rs. 10 is 5

Answer 3

for that question there is 10 and 20 rs notes... total is 230.. so u need odd no of 10 rs notes ... so it will be a or c ... now 5*10+20*9= 230 ... no of notes 9+5=14 .... so option A ... u can calculate by taking X .. by sometimes u can guess the by jst observing it ..