There is a batch of sand on the construction site. One eighth of the total amount is used every day. After a week, there are still four fifths of tons left. How many tons are there in total?

There is a batch of sand on the construction site. One eighth of the total amount is used every day. After a week, there are still four fifths of tons left. How many tons are there in total?

(Note: Here '/' is the division sign of the fractional line and the numerator in the fraction is on the left and the denominator is on the right.)
1-1 / 8 * 7 = 1 / 8
This 1 / 8 corresponds to 4 / 5 tons, so the total amount is
(4 / 5) / (1 / 8) = 6.4 (32 / 5) (T)
A: there are 6.4 tons of these stones
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