Question 1159835
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Let N be the number of grams of the salt in the bin.


Consider the number N+7.


From the condition, the number N+7 is divisible by 10

and gives the remainder 4+7 = 11 equivalent to 2 when divided by 9.


The smallest positive integer N+7 with such properties is 20, i.e. N = 20-7 = 13.


The next such integer N+7 is 20+90 = 110, i.e. N = 103.


The general formula for N is  N = 13 + 90k, where k = 0, 1, 2, 3, . . . 
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