Dinosaurs

More than 30 and less than 60 dinosaurs have met at the pond. A quarter of them bathed and 1/7 saws and the rest gripped. How many were at the pond? How many were there?

Correct result:

n =  56
j =  8

Solution:

n1=4 7=28 30<n<60 n=2 n1=2 28=56
j=n/7=56/7=8



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