Question

Jon has $50$ triangular hangers in his cupboard. He wants to cover all the edges of the hanger with a decorative tape. One roll of ribbon is of length $250$ cm. Each hanger has two sides measuring $40$ cm and one side measuring $75$ cm.

The number of Tape rolls required are :

• A. $21$
• B. $50$
• C. $31$
• D. $40$

Answer 1

The correct option is C $31$

Tape required for one Hanger = Perimeter of one Hanger

$=(40+40+75)$ cm

$=155$ cm

Tape used for $50$ Hangers = Perimeter of $1$ Triangle $\times$ Number of hangers

$=155\times 50=7750$ cm

Length of ribbon of one tap $=250$ cm

$\therefore \text{Number of taps required}=\frac{\text{Total length of ribbons require}}{\text{Length of ribbon in one tap}}$

$⟹\text{Number of taps required}=\frac{7750}{250}=31$

Therefore, Number of taps required $=31$, (c) is the correct option.