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

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

Write the pair of fractions as a pair of fractions with a common denominator