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Answer:

given,

(1/3+1/4+1/5)

so other number we WANT find ,

the number be x

(1/3+1/4+1/5) + x = 4

LCM OF 3,4,5 is 60

1/3= 1/3×20/20 = 20/60

1/4=1/4×15/15 = 15/60

1/5= 1/5 ×12/12= 12/60

now add the all

(20/60 + 15/60+ 12/60). + x = 4

(47/60) + x. = 4

x= 4 - 47/60

LCM is 60

x = 240-47/60

x= 193/60

verification:

20/60+15/60+12/60+193/60 = 4

47/60+193/60 =4

240/60=4

4=4

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