Question

Average of four no is 40 first 3 no is 75 find four no​

Answer 1

Answer:

- 65

Step-by-step explanation:

x +y+z/3 = 75

x+y+z = 225

let four no be a

x+y+z+a/4 = 40

x+y+z+a = 160

a = 160 - (x+y+z)

a = -65