Question

Mary wants to cover a gift box whose dimensions are 8cm x 6 cm x 2 cm with square stamps of side 2 cm each.How many stamps she has to collect so as to cover the entire gift box?

• A. 32
• B. 38
• C. 46
• D. None of these

Answer 1

The correct option is B 38

Length =8 cm, Breadth = 6 cm, Height = 2 cm.

The total surface area of the box = 2(lb + bh + hl)

= 2[(8 $\times$ 6) + (6 $\times$ 2) + (2 $\times$ 8)] $c{m}^2$

= 152 $c{m}^2$

The area of each stamp = 2 $\times$ 2 $c{m}^2$

= 4 $c{m}^2$

Therefore, number of stamps required = $\frac{totalsurfaceareaofgiftbox}{areaofonestamp}$

= $\frac{152}{4}$ = 38 stamps