Question

If 5 is subtracted from twice a number, the result is 15. Find the number. ​

Answer 1

Step-by-step explanation:

10 is the number.

Explanation: 10 multiple by 2 is 20.

20 subtracted from 5 is 15.

So the answer is 10.

Answer 2

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10

$\small\bold{\texttt { \red{Step\: 1} }}$

2x-5=15

$\small\bold{\texttt { \red{Step\: 2} }}$

x-5=15/2

$\small\bold{\texttt { \red{Step\: 3} }}$

x=15+5/2

$\small\bold{\texttt { \red{Step\: 4} }}$

x=20/2

$\small\bold{\texttt { \red{Step\: 5} }}$

x=10

$\color{Purple}{\large\underline{\underline\mathtt{Additional \ imformation↓↓↓}}}$

The following above solution is by algebraic expressions.

In order to the statement give tge equation has been formed as;

2x-5=15

Now here 2x has been written before 5 as in the statement it clarifies that a number is subtracted "from".

And from means the number we get will be subtracted.

As x is unknown we need to place it before.

After that as we saw that 5 is in L.H.S. we need to place it to R.H.S and for that we also need to change the sign.

i.e., -5 will change to +5 on R.H.S.

After that 15+5 is equal to 20.

Now one more constant is there left on L.H.SM now when it moves to R.H.S. it will be divuded as in L.H.S it was multiplied.

2x means 2×x.

Now on division it gave 10.

As we can see that on both the sides no incorrect characters are placed.

Hence 10 is the value of x.

What are algebraic expressions?

Algebraic expressions represent mathematical ideas and operations in a short way using symbols and variables.

How are mathematical expressions formed?

Constants,variables and operation symbols are combined to form matgematical expressions.

What are constants?

A symbol in algebra which has a fixed value, i.e., its value does not changes is called a constant.

What are variables?

A symbol which can be assigned different numerical values is called a variable.

In algebra , the varisbles are denoted by the letters in the English Alphabet.

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