A contractor purchased house and spend 30% of its cost price on repairs and painting and then he sold the house for rupees 335400 made of profit of 20%. At what price did the contractor purchase the house ? a. rs 215000
b. rs 222500
c. rs 225000
d. rs 217500

the answer is c hope it

step-by-step explanation:

good luck on your studies! : )

david edward.

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb