Question

1. Three times a number decreased by 5 gives the
result 16. Find the number.
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Answer 1

Answer:

7

Step-by-step explanation:

3x -5 = 16

3x = 16+5

3x = 21

x = 21/3

x =7

Answer 2

Answer:

7

Step-by-step explanation:

Let the number be x

Three times the number = 3*x = 3x

Three times the number decreased by 5

= Three times the number - 5 = 3x - 5

Three times the nubmer decreased by 5 gives 16

⇒3x - 5 = 16

⇒3x = 21 (Moving -5 to right hand side gives +5, i.e Inversion of sign.)

⇒x = 21/3(When there is only 1 term on each side, they can change sides only if they are involved in multiplication or division.)

⇒x = 7 (3* 7 = 21 ⇒21/3 = 7)