Question

If 8 pens cost Rs. 84 , how much do 14 pens cost ?

• A. 127
• B. 145
• C. 147
• D. 144

Answer 1

The correct option is C

147

Let the cost of 14 pens be x. Then,

Ratio of number of pens = Ratio of their costs

=> 8: 14 = 84 : x

In the proportion , product of extremes = product of means

=> $8\times x=14\times 84$

=> 8x = 1176

=> $x=\frac{1176}{8}$

=> x= 147