A closed rectangular carton measures 30 cm by 25 cm by 15 cm. The cardboard for it is bought with 5% added for flaps and overlaps. How many cm² of cardboard are bought?

Question

Accepted Answer

3307.5. Surface area = 2(30 × 25 + 25 × 15 + 30 × 15) = 2(750 + 375 + 450) = 3150 cm². With 5% added, the cardboard bought = 3150 × 1.05 = 3307.5 cm². (3150 cm² leaves out the allowance; 3465 cm² adds 10% instead of 5%; 1653.75 cm² counts each pair of opposite faces once, forgetting the 2 in the formula.)

A closed rectangular carton measures 30 cm by 25 cm by 15 cm. The cardboard for it is bought with 5% added for flaps and overlaps. How many $cm^{2}$ of cardboard are bought?

Step-by-Step Solution

Master this topic in 30 minutes a day.

More Areas & Volumes practice

A closed rectangular carton measures 30 cm by 25 cm by 15 cm. The cardboard for it is bought with 5% added for flaps and overlaps. How many cm2 of cardboard are bought?

Step-by-Step Solution

Master this topic in 30 minutes a day.

More Areas & Volumes practice

A closed rectangular carton measures 30 cm by 25 cm by 15 cm. The cardboard for it is bought with 5% added for flaps and overlaps. How many $cm^{2}$ of cardboard are bought?