Others Maths Puzzle

the average of first nine prime numbers is

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Others Other Question

An army 50 miles long marches at a constant rate. A courier standing at the rear moves forward and delivers the message to the first person and then turns back and reaches the rear of the army as the army completes 50 miles. Find the distance travelled by the courier. a,b,c are in continued proportion; b,c,d are also in continued proportion; if b:c = 2:3 and all
the four numbers are positive integers, what is the minimum possible value of (a+d)?