Question

the area of the vertical surface of a brick is 480 cm^2 .Its height and length is 8cm and 20cm . find its length

Answer 1

Step-by-step explanation:

verical surface area = 2(lh+bh+lb)

480cm^2 = 2(20×8+b8+20b)

480÷2=160+b8+20b

160-24=b8+20b

136=28b

136/28=b

b=4.8cm

Answer 2

QUESTION:

• the area of the vertical surface of a brick is 480 cm^2 .Its height and length is 8cm and 20cm . find its length

ANSWER:

VERTICAL SURFACE AREA= 2(lh + bh + lb)

480 ={ 2(20)(8) + b (8) + 20 (b) }

$\\ \\ \\ \\ \frac{480}{2} = 160 + 8b + 20b \\ \\ \\ \\ 160 - 24 = 28b \\ \\ \\ \\ b = \frac{136}{28} \\ \\ \\ \\ = 4.8cm$