Sun	Mon	Tue	Wed	Thu	Fri	Sat
23	24	25	26	27	28	1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30	31	1	2	3	4	5

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Multiple Choice Questions

Out of the four numbers the average of the first three is 16 and that of the last three is 15 If the...........

Quantitative Aptitude (MPPCS) Average

Out of the four numbers the average of the first three is 16 and that of the last three is 15. If the last number is 20 then find the average of first number?

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Explanation:

Average of a, b, c first three = 16

total of a + b + c = 16 ×× 3 = 48 ......(i)
Average of last 3 numbers b, c and d = 15
then total (b + c + d) = 15 ×× 3= 45 ......(ii)
from (i) - (ii)
=a + b + c - (b + c + d) = 48 - 45
= a - d = 3 = a - 20 = 3 [d = 20] = a = 23
=Therefore, first number a = 23