Question

the average of 13 results is 68 the average of first 7 is 63 and that of last 7 is 70 7th result is​

Answer 1

Answer:

47

Step-by-step explanation:

(a+b+....m)

------------------ = 68

13

(a+b+....m) = 68*13

(a+b+....m) = 884 .......(1)

(a+b+..g)/7 = 63

(a+b+..g) = 441 .....(2)

(g + h + ...m)/7 = 70

(g+ h+ ...m) = 490 ........(3)

Adding (2) & (3),

(a+b+ ...m)+g = 931

884 +g = 931

g = 47