Question

$\frac{1}{120 } + \frac{1}{30} + \frac{1}{x} = \frac{1}{15}$
what is x pls help urgent! ​

Answer 1

Answer:

x = 40

Step-by-step explanation:

$\frac{1}{120} + \frac{1}{30} + \frac{1}{x} = \frac{1}{15}$

=> $\frac{1+4}{120} + \frac{1}{x} = \frac{1}{15}$

=> $\frac{5}{120} + \frac{1}{x} = \frac{1}{15}$

=> $\frac{1}{x} = \frac{1}{15} - \frac{5}{120}$

=> $\frac{1}{x} = \frac{8-5}{120}$

=> $\frac{1}{x} = \frac{3}{120}$

=> $\frac{1}{x} = \frac{1}{40}$

=> x = 40 (Ans)

Answer 2

Answer

x=40

explanation

1/120+1/30+1/x =1/15

collect the lecterns together

1/120+1/30-1/15= -1/x

find the LCM of the denominator

the LCM will be 120

1/120+1/30-1/15 =-3/120

-3/120=-1/x

x=40