SOLUTION: a photographer was set to reduce the dimensiopn of a drawing to 70% of their orginal size. If the reduction was repeated until the final dimension were about 6% of the original dim
0.06 =
Take logarithm base 10 of both sides
log(0.06) = n*log(0.7)
n = = 7.88788...
Round to the closest greater integer and get the ANSWER : the number of reductions was 8.