Question

What is the answer ?

Answer 1

To find :

• angle of 3x

Hint :

• first we have to find the value of x

Step by step expansion:

• x + 2x + 3x + 4x + 5x = 180°

Why?

Reason: angles that are formed on a straight line is equal to 180°

• 15x = 180°

• x = 180°/15

• x = 12

.°. value of x = 12

we need value of 3x

put the value of x in 3x

• 3 × 12
• 36°

REQUIRED ANSWER = 36°

Answer 2

Answer:

$5x + 4x + 3x + 2x + x = 180° \\ 15x = 180° \\ x = 180° \div 15 \\ x = 12° \\ 3x = 12 \times 3 \\ 3x = 36°$