If the total surface area of a cuboid, whose length,
breadth, height are x, 80 cm, 40 cm respectively
is 11200 cm² , then x =
(1) 50 cm
(2) 30 cm
(3) 20 cm
(4) 25 cm
Answers
Answered by
2
TSA =
2[lb + bh + lh] = 11200
2[ 80x + 3200 + 40x ] = 11200
2[ 120x + 3200 ] = 11200
Dividing with 2 on both sides
120x + 3200 = 5600
120x = 5600-3200
120x = 2400
x = 2400/120 = 20 cm
Option (3) is correct
2[lb + bh + lh] = 11200
2[ 80x + 3200 + 40x ] = 11200
2[ 120x + 3200 ] = 11200
Dividing with 2 on both sides
120x + 3200 = 5600
120x = 5600-3200
120x = 2400
x = 2400/120 = 20 cm
Option (3) is correct
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