number of pens with B = 60/2 = 30
number of pens with C = 60/3 = 20
number of pens with D = 60/4 = 15 (an odd number)
number of pens with E = 60/5 = 12
number of pens with F = 60/6 = 10

Now since adding is not an option, we can simply multiply by 2 convert odd numbers to even. Therefore A becomes 60 × 2 = 120

Similarly doubling all and adding we get total number of pens bought by X = 120 + 60 + 40 + 30 + 24 + 20 = 294