Three times a number plus 18 is 45. Find the number.
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Three times a number plus 18 is 45. Find the number.
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To make answer easier to understand , the whole solution is divided into parts.
First let :-
Part one :-
Three times a number
Equation :-
3x
{When ever there is times a number then we multiply the given values. eg :- 3 times 2 which means 3 × 2. Now why I wrote 3x instead of 3 × x? because we don't need to put multiplication a sign while mutiplying number with variable}
Part two :-
plus 18
Equation :-
3x + 18
{Now plus means to add two numbers . (+) is the sign when we represent that two numbers should be added}
Part three:-
is 45
Equation :-
3x + 18 = 45
{(=) means that the whole equation's value i.e 8x + 18 is equal to 45}
Part four :-
In this part we have to simply find value of x.
Given equation :-
3x + 18 = 45
Steps :-
→3x + 18 = 45
→3x = 45 - 18
→3x = 27
→x = 27/3
→x = (3 × 3 × 3)/3
→x = (3 × 3)/1
→x = 3 × 3
→x = 9
As we have supposed number as x
.°. The value of unknown number is 9