Question

The weight of $72$ books is $9$ kg. What is the weight of $40$ such books?

• A. $4$ kg
• B. $6$ kg
• C. $8$ kg
• D. $5$ kg

Answer 1

The correct option is D $5$ kg

Weight of $72$ books $=9$ kg
Weight of $1$ book $=\frac{9}{72}$ kg
Weight of $40$ books $=\frac{9}{72}\times 40$ kg $=5$ kg