Question

the average of first three out of four number is 18 the average of last three number is 14 the sum of first and last number is 16 the last number is what​

Answer 1

Answer:

2

Step-by-step explanation:

letnos. be a,b,c,d

$\frac{a + b + c}{3} = 18$

$\frac{b + c + d}{3} = 14$

$a + c = 16$

so,a+b+c=54-------(1)

b+c+d=42--------(2)

adding (1)&(2)

a+2b+2c+d=96

2b+2c=80 (subtract a+c)

b+c=40-----------(3)

subtract (3)from (2)

d=last no.=42-40=2

mark as brainlest