Question

answer this question​

Answer 1

$\huge{\underline{\underline{\textsf{Question}}}}$ :-

When 12 is subtracted from thrice a number, the result is 15. Find the number.


$\huge{\underline{\underline{\textsf{Solution}}}}$ :-

Let the number be x

Thrice the number means 3 × x = 3x

12 subtracted from thrice the number = 3x - 12

The result obtained is 15


According to the given condition

3x - 12 = 15

Move the constant -12 to the RHS. -12 will become 12. Remember while shifting any number or variable from LHS to RHS or vice versa, + changes to - and - to +, × to ÷ and ÷ to ×

☛ 3x = 15 + 12

Add

☛ 3x = 27

Divide both the sides by 3

☛ $\dfrac{3x}{3} = \dfrac{27}{3}$

After dividing, we get x as :

∴ x = 9 ✓✓


∴ The number is $\large{\boxed{\boxed{\textsf{9}}}}$

Answer 2

$\underline{\underline{\bold{Question:}}}$

When 12 is subtracted from thrice a number, the result is 15. Find the number.

$\tt{Solution:}}}$

$\tt{Let\:the\:number\:be\:x.}$

• Three times the no. = 3 × x = 3x.

According to question ,

When 12 is subtracted from thrice a number, the result is 15.

$\implies{\bold{3x-12=15}}\\\\\underline{\bold{\textsf{By adding 12 both side we get,}}}\\\\\\\implies{\bold{3x-12+12=15+12}}\\\\\\\implies{\bold{3x=27}}\\\\\\\underline{\bold{\textsf{Dividing by 3 both side we get,}}}\\\\\\\implies{\bold{\dfrac{3x}{3}=\dfrac{27}{3}}}\\\\\\\implies{\bold{x=9.}}\\\\\\\boxed{\boxed{\bold{Number=9.}}}$