Which is greater 6/142 or 4/136

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Need solving this second acceleration problem.

Which value would be a solution for x in the inequality 47-4x< 7