Question

set up the equations. The sum of a three times a no. and 15 is
45. Find the number.​

Answer 1

Answer:

let the no. be X,

So, according to the question,

X + X + X + 15 = 45

3X + 15 = 45

3X = 45 - 15 ( transpose 15 from LHS to RHS and change '+' to '-'. )

3X = 30

X = 30/3 (30 divided by 3. )

X = 10.

So, X = 10.