Question

solve this sum please ​

Answer 1

Answer:

Cost of 12 Gel pens = 144

Cost of 1 Gel pen = (144/12) = 12

Now, Cost of one Ball pen = (81/9) = 9

(a.) Cost of Gel pen = 12

Cost of Ball pen = 9

(b.) Cost of 5 gel pens = 5 × 12

Cost of 4 gel pens = 4 × 9

Reduce to the smallest primes, and there you have your answer. :)