the average of 4 numbers is 85. if 3 of those numbers are 76, 78, and 81, what is the 4th number

i really need helpon this
in Word Problem Answers by Level 1 User (120 points)

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4 Answers

the average of 4 numbers is 85. if 3 of those numbers are 76, 78, and 81, what is the 4th number

(76 + 78 + 81 + x) / 4  =  85

76 + 78 + 81 + x = 85 * 4
                              = 340

x =  340 - 76 - 78 - 81

by Level 1 User (380 points)
(76+78+81+x)/4=85

(235=x)/4=85

235+x=340

340-235=105

x=105
by

85*4=340

340-(76+78+81)=105

...which means the 4th number is 105

by Level 9 User (42.6k points)
340 i believe is your accurate answer. let me know if you need more help and i'll be there
by Level 3 User (2.7k points)

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