IBPS PO Prelims Model Paper 13

Let x be the price of one capsule
y be the total number of capsule.
xy = 216 ...(1)
(x – 10) (y + 15) = 216 ...(2)
From eqs (1) and (2)
(

216

y

−10)(y+15)=216
(216 – 10y) (y + 15) = 216 y
216y + 216 × 15 – 10y‌2 – 150y = 216y
216y + 3240 – 10y‌2 – 150y = 216y
–10y‌2 – 150y + 3240 = 0
y‌2 + 15y – 324 = 0
y = 12