Question

find the cost of painting of cuboid dimensions 20 cm × 15 cm × 12 CM at the rate of 5 Paisa per square centimetre ​

Answer 1

Step-by-step explanation:

Surface area of cuboid = 20 * 15 * 12

• Surface area of cuboid = 3600
• Cost of painting = 3600 * 5
• Cost of painting = Rs. 18000

Answer 2

Answer:

your answer is rupees 72

Step-by-step explanation:

Dimensions of cuboid

$l = 20cm \\ b = 18cm \\ h = 12cm \\ \\ tsa \: of \: cuboid \: = 2(lb + bh + lh) \\ 2(20 \times 15 \times + 15 \times 12 + 20 \times 12) \\ = 2(300 + 180 + 240) \\ = 2(720) \\ = {1440cm}^{2} \\ cost \: of \: painting \: per \: {1cm}^{2} = paisa = \frac{5}{100} rupees \\ \\ = {1cm}^{2} = \frac{5}{100} rs \\ \\ {1440cm}^{2} = x \\ {1cm}^{2} \times x = \frac{5}{100} \times {1440cm}^{2} \\ \\ {1cm}^{2} \times x = {72cm}^{2} \\ x = \frac{ {72cm}^{2} }{ {1cm}^{2} } \\ x = 72rupees$

hope this helped you.......

i am from TS.....