If the cost of 6 erasers and 4 sharpeners is Rs.21/-. What will be the cost of 24 erasers and 16 sharpeners?  Select the correct option.
A) Rs.62/- B) Rs.84/- C) Rs.64/- D) Rs.88/- E) Rs.99/-
Explanation:   6 erasers + 4 sharpeners = Rs.21.   Multiply by 4   We get,   24 erasers + 16 sharpeners = Rs.21x4 = Rs.84/-.   Answer: Option Rs.84/-
<result>B</result>
If the cost of 6 erasers and 4 sharpeners is Rs.21/-. What will be the cost of 24 erasers and 16 sharpeners?