212
215
513
20
Correct answer is A
Let x represent the price of an orange and
y represent the number of oranges that can be bought
xy = 240k, y = 240x.....(i)
If the price of an oranges is raised by 12k per orange, number that can be bought for N240 is reduced by 16
Hence, y - 16 = \frac{240}{x + \frac{1}{2}
= 4802x+1
= 4802x+1.....(ii)
subt. for y in eqn (ii) 240x - 16
= 4802x+1
= 240−16xx
= 4802x+1
= (240 - 16x)(2x + 1)
= 480x
= 480x + 240 - 32x2 - 16
480x = 224 - 32x2
x2 = 7
x = √7
= 2.5
= 212k
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