L&T Company Numerical Ability Averages

The average of three consecutive odd numbers is 12 more than one third of the first of these numbers. What is the last of the three numbers?
(1) 15
(2) 17
(3) 19
(4) Data inadequate
(5) None of these

Read Solution (Total 3)

x,x+2,x+4 are three odd numbers
(x+x+2+x+4)/3=12+(x/3)
x=15
last no.=x+4=19
8 years agoHelpfull: Yes(1) No(0)

For easy calculations:
Let central number be x. Then first number = x-2, last number = x+2.
Thus (x-2+x+x+2)/3 = 1/3(x-2) + 12
or, x = x/3 + 34/3.
x = 17.
Last number = 19.
8 years agoHelpfull: Yes(1) No(0)
Answer
3. 19
7 years agoHelpfull: Yes(0) No(1)

L&T Other Question

Out of seven given numbers, the average of the first four numbers is 4 and that of the last four numbers is also 4. If the average of all the seven numbers is 3, fourth number is
(1) 3
(2) 4
(3) 7
(4) 11
(5) None of these A tradesman marks his goods 30% above cost price. If he allows discount of 6(1/4)%, then his gain per cent is:
(a) 22%
(b) 21(7/8)%
(c) 23(3/4)%
(d) 36(1/4)%
(e) None of these