A tank measures 20m in length, 5m in breadth and it is 25m tall, what is the total surface of the tank

140m sq.

Step-by-step explanation:

The tank is a cuboid open at the top.

Surface area of a cuboid = 2(lb + bh + hl)

Surface area of a tank open at top = Surface area of cuboid - Area of the portion open at the top i.e.

2(lb + bh + hl) - lb = 2 (10*5 + 5*3 + 3*10) - 10*5

2(50+15+30) - 50 = 2*95 - 50 = 190 -50 = 140m sq.

answer:

it will cost 480 dollars to refurbish the larger wood floor

step-by-step explanation:

as it's a ratio of 4 that costs 384 dollars, divide the price by the ratio

384 / 4 = 96 dollars

96 dollars per unit of the ratio

now to get the price to refurbish the larger wood floor, times the price by the units

96 * 5 = 480

the 3rd option is right

step-by-step explanation: