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If \(\dfrac{x}3+\dfrac{x}4+15=x,\) then \(x =\)

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Re: If \(\dfrac{x}3+\dfrac{x}4+15=x,\) then \(x =\)

by deloitte247 » Sat Oct 24, 2020 4:36 am
$$\frac{x}{3}+\frac{x}{4}+15=x$$
Take the lcm
$$\frac{4x+3x+180}{12}=x$$
$$4x+3x+180=12x$$
$$7x+180=12x$$
$$180=12x-7x$$
$$180=5x$$
$$x=\frac{180}{5}=36$$

Answer = option C
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Re: If \(\dfrac{x}3+\dfrac{x}4+15=x,\) then \(x =\)

by Scott@TargetTestPrep » Tue Oct 27, 2020 8:29 am
VJesus12 wrote: ↑
Tue Oct 20, 2020 2:53 am
 If \(\dfrac{x}3+\dfrac{x}4+15=x,\) then \(x =\)

A. 18
B. 24
C. 36
D. 48
E. 60

Answer: C

Solution:

Multiplying the equation by 12, we have:

4x + 3x + 180 = 12x

180 = 5x

36 = x

Answer: C

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