the sum of four numbers in g.p is 60 and the arithmetic mean of the first and the last is 18 .the numbers are
Kuldeepnehra:
What is g.p in question?
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Let four numbers are A,B,C &D, then as per question
A+B+C+D=60
A.M. of A&D is 18
Means A+D/2=18
A+D=18*2=36
A=36-D & D=36-A
36-D+B+C+36-A=60
72+B+C-A-D=60
As A+D=36
72-60+B+C=A+D=36,So
12+B+C=36
B+C=36-12=24
A+D=36
B+C=12
A+B+C+D=60
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