70
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700 ÷ 10 = 70
There are 700
700 - 10% = 700 x (1 - (10/100)) = 700 x 0.9 = 630
10 times as much as 700 is 7,000. So 700 is 1/10 of 7,000. 10 times as much as 700 is 1/10 as much as 70,000.
1 decade = 10 years, so 700 years / (10 years/decade) = 70 decades.