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If (3+5+7+ . . . .+"n terms")/(5+8+11+ ...

If `(3+5+7+ . . . .+"n terms")/(5+8+11+ . . .. +"10 terms")=7`, then the value of n, is

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If (1 + 3 + 5 + .... " upto n terms ")/(4 + 7 + 10 + ... " upto n terms") = (20)/(7 " log"_(10)x) and n = log_(10)x + log_(10) x^((1)/(2)) + log_(10) x^((1)/(4)) + log_(10) x^((1)/(8)) + ... + oo , then x is equal to