1. (no.37)math, k=10^ n-38 k is integer, the result of adding all units of k is 350, n =?
n=40.
Idea: 10^n-38=99999...62 so, 9*X+8=350,X=38, so n=40
2....Juice, the first day add SAME AMOUNT WATER with the juice, the second day, add the twice water to juice than the first day. the revenus for two days are the same. On the first day, each cup of juice is $0.6/cup, how much one cup of juice on the second day?
I didn't find it is the same amount water mixed with the juice,so waste a lot of time on this problem.
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Verbal
1,logics, the ONE ,the lumb for the house problem...
In sum,
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