Question

A book with measures 25cm ×18cm ×4cm is to be covered with a brown paper . How many metres of brown paper of width 40cm are required to cover 100 such books

Answer 1

$\huge {\mathfrak {Solutions :}}$


Given :
A book with measures 25 cm × 18 cm × 4 cm


Find the Total surface area of book :-

Total surface area = 2 (lb + bh + lh) square units
= 2 (25 × 18 + 18 × 4 + 25 × 4) cm²
= 2 (450 + 72 + 100) cm²
= 2 (622) cm²
= 1244 cm²

Total surface area of 100 books
= 100 × 1244 cm² = 124400 cm²


Surface area 1 m brown paper = 100 cm × 40 cm = 4000 cm²


Therefore,

$\bold {\frac{124400}{4000} = 31.1 }$


Hence,
31.1 metres of brown paper wil cover the total surface of 100 such books.

Answer 2

Answer:

Step-by-step explanation: