Question

The height of one box is 15 cm 8 mm. The height of the second box is 23 cm 6 mm. The third box is twice the height of the second box. What is the total height of the boxes if all the boxes are placed one above other?

• A. 86 cm
• B. 86 cm 6 mm
• C. 86 cm 60 mm
• D. 85 cm 60 mm

Answer 1

The correct option is B 86 cm 6 mm

Height of the first box = 15 cm 8 mm
Height of the second box = 23 cm 6 mm
Height of the third box = 2 × height of second box
= 2 × 23 cm 6 mm
= 46 cm 12 mm
1 cm = 10 mm
Total height of all three boxes = 15 cm 8 mm + 23 cm 6 mm + 46 cm 12 mm
= 150 mm + 8 mm + 230 mm + 6 mm + 460 mm + 12 mm
= 866 mm
= 860 mm + 6 mm
= 86 cm 6 mm