What is the height of a cuboid whose total surface area is 650 cm2 ? The cuboid is 10 cm long and 7 cm wide.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 15 cm.
Total surface area = 2 ( lb + bh + hl)
650 = 2 ( 10 × 7 + 7h + 10h)
650 = 140 + 34h
34h = 650−140 = 510
34h = 510
h=510/34= 15 cm