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if there are 25 students in a class. on an exam 4 got the grade 7 or higher both in math and chemistry. three more got the grade 7 or higher in chemistry than in math and eight for lower than 7 in both math and chemistry. how many kids got a 7 or higher in math?

draw a venn diagram and form an equation

can anyone explain to me how i can get the answer? i’ve been stuck at this for some time

Answer this question only if you know the answer! 30 points and

Asays "we are both knaves" and b says nothing. exercises 24–31 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and spies (called normals by smullyan [sm78]) who can either lie or tell the truth. you encounter three people, a, b, and c. you know one of these people is a knight, one is a knave, and one is a spy. each of the three people knows the type of person each of other two is. for each of these situations, if possible, determine whether there is a unique solution and determine who the knave, knight, and spy are. when there is no unique solution, list all possible solutions or state that there are no solutions. 24. a says "c is the knave," b says, "a is the knight," and c says "i am the spy."

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