Question

An open tank is in the shape of a cube. The measure of its inner edge is 25 cm. Calculate the cost of painting the inner sides at the rate of Rs. 0.15 per sq. cm.

Answer 1

Given : An open tank is in the shape of a cube. The measure of its inner edge is 25 cm.

To Find :  Cost of painting the inner sides at the rate of Rs. 0.15 per sq. cm.

Solution:

inner edge = 25 cm

tank is open hence no top

So surface area = 5 (25)²

= 3125 cm²

Cost of painting  = 0.15 * 3125

= 468.75 Rs

cost of painting the inner sides  = 468.75 Rs

Learn More:

There is some water in a cylindrical vessel of base diameter 14

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after the surface area of cube is painted the cube is cut into 64

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Answer 2

$\huge\boxed{\fcolorbox{black}{red}{☆ANSWER☆}}$

$\bf\red{GIVEN :}$

$\red\bigstar$ An open tank is in the shape of a cube.

$\red\bigstar$ The measure of its inner edge is 25 cm.

$\bf\red{TO \: FIND :}$

$\red\bigstar$ Calculate the cost of painting the inner sides at the rate of Rs. 0.15 per sq. cm.

$\bf\red{SOLUTION :}$

Tank is open so, we will not include the top side of the tank.

$\red\bigstar$ Surface Area of tank = 5a²

→ Surface Area of tank = 5 (25)²

→ Surface Area of tank = 5 × 625

→ Surface Area of tank = 3125 cm²

$\red\bigstar$ Cost of painting = 0.15 × 3125

→ Cost of painting = Rs. 468.75

$\small\boxed{{\sf\red{Hence, \: the \: cost \: of \: painting \: the \: inner \: sides \: is \: Rs. \: 468.75}}}$

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