Question

Find the number of blades in n fans if each fan has 4 blades.

• A. 4n
• B. n
• C. 3n
• D. 2n

Answer 1

The correct option is A 4n

As given,

1 fan need $4\times 1$ = 4 blades

now,
2 fans need $4\times 2$ = 8 blades
3 fans need $4\times 3$ = 12 blades
4 fans need $4\times 4$ = 16 blades
. .
. .
. .
. .
n fans need $4\times n$ = 4n blades

$\therefore$ For n number of fans 4n blades are required.