Question

arjun has aclosed cuboidal tank of dimensions 7.5m x 3.5m to collect rain​

Answer 1

Answer:

area to be painted =

$(7.5 \times 2.5 \times 2) + (7.5 \times 3.5 \times 2) \\ 59.5m ^{2}$

cost to paint the tank at rs 7 per m² =

$59.5m {}^{2} \times 7rs \\ 416.5 \: rs$

Answer 2

Step-by-step explanation:

Area to be painted = TSA - (area of bottom)

=> 2(lh + bh + lb) - lb

=>2(7.5×3.5 + 2.5×3.5 + 7.5×2.5) - (7.5×2.5)

=> 2 ( 26.5 + 8.75 + 18.75) - 18.75

=> 2 (54) - 18.75

=> 89.25 m²

cost of painting = 89.25 × 7 => Rs 624.75