QUESTION IN PICTURE

PLEASE ANSWER

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How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236