ET/IX/2018(ii)The cost of painting the whole surface area of a cube at

1.	ET/IX/2018(ii)The cost of painting the whole surface area of a cube at the rate of 13paise per cm2 is 343.98. The volume of the cube is:(1) 8.0 cm3(3) 10.648 cm3O.(2) 9.261 cm(4) 13.824 cm38.0聑衬ofto10.648 ofto(2)(4)9.26 1日可,,to(1)(3)13.824o
Answer» It takes Rs.13/100 to paint 1cm² Total cost was Rs.343.98 Total area of the cube is 343.98/0.13=2646cm² TSA of cube = 6s² 6s²= 2646 s² = 2646/6 s²= 441 s = √441 = 21cm Volume of cube is s³ s³ = 21³ = 9261cm³. The option given is wrong, this answer is correct. Like my answer if you find it useful!

ET/IX/2018(ii)The cost of painting the whole surface area of a cube at the rate of 13paise per cm2 is 343.98. The volume of the cube is:(1) 8.0 cm3(3) 10.648 cm3O.(2) 9.261 cm(4) 13.824 cm38.0聑衬ofto10.648 ofto(2)(4)9.26 1日可,,to(1)(3)13.824o

Answer»

It takes Rs.13/100 to paint 1cm²

Total cost was Rs.343.98

Total area of the cube is 343.98/0.13=2646cm²

TSA of cube = 6s²

6s²= 2646

s² = 2646/6

s²= 441

s = √441 = 21cm

Volume of cube is s³

s³ = 21³ = 9261cm³.

The option given is wrong, this answer is correct.

Like my answer if you find it useful!