Question

Solve: 20x + 15 ≤ 120

Answer 1

Here we are given an expression 20x + 15 ≤ 120

We have to solve the expression for 'x'

In order to find the value of 'x' we will have to rearrange the expression$20x + 15 \leq 120\\20x\leq 120-15\\20x\leq 105\\x\leq \frac{105}{20}\\x\leq 5.25$

So, $x\leq 5.25$

This means that the value of 'x' will be less than or equal to 5.25

Answer 2

Given data,

The given equation is $20x + 15\leq 120$

Now here we have to find the value of $x$

In order to find the value of $x$ we have to transpose all the constant terms to RHS.

So, transpose $15$ to RHS, the positive value becomes negative when it is transposed to other side.

We get,

$20x \leq 120-15$

$20x \leq 105$

Also transpose $20$ to RHS we get,

$x \leq \frac{105}{20}$

The value $105$ can be written as $5\times 21$

The value $20$ can be written as $5\times 4$

$x\leq \frac{21\times5}{5\times4}$

$x\leq \frac{21}{4}$

Also, the value of $x$ can be written as $5.25$

Therefore, the value of $x$ is $5.25$ or $\frac{21}{4}$