Question

Thrice a number is equal to a number increased by 15.Find the number.​

Answer 1

Let the unknown number be x .

Then, According to the question,

$\huge \bf3x = x + 15 \\ \\ \leadsto \rm 3x - x = 15 \\ \leadsto \rm \: \: \: \: \: \: \: \: 2x = 15 \\ \leadsto \rm\: \: \: \: \: \: \: \: \: \: x = \frac{15}{2} \: \: \: \: = \frak{\red{7.5}}$

Answer 2

Answer:

x = 15/2

Step-by-step explanation:

Let x be the number

3x = x + 15

3x - x = 15

2x = 15

x = 15/2

Check ⇒ 3x = x + 15

x = 15/2

3 × 15/2 = 15/2 + 15

45/2 = 15/2 + 30/2 [L.C.M = 2]

45/2 = 45/2

Hence, the answer is correct.