Among three numbers, the first number is thrice the second number and one-fourth of
- the third number. The average of all three numbers is 64. What is the average of first
and third number?
(a) 30
(b) 24
(c) 90
(d) 48
Answers
Answered by
2
Answer:
(c)90
Step-by-step explanation:
let numbers be:
X/4,X/12,X
given
(X/4+X/12+X)/3 =64
X= 144
now
( X + X/4)/2 = (144+36)/2
=90
Answered by
0
Answer:
30
Step-by-step explanation:
let first no. be 'x'
2nd no. = x/3 & 3rd no. = 4x
sum = 64
x + x/3 + 4x = 64
16x/3 = 64 => x = 12 (1st no.)
2nd no. = 12/3 = 4 & 3rd no.= 4×12 = 48
average of first and third number
= (12+ 48)/2 = 60/2 = 30
option(a) is correct
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