Odd and Even Math Problem Challenge

Sarah had 8 apples and gave half to her friend. How many apples does she have now?

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There are 5 groups of students. Each group has 6 students. How many students are there in total?

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Mark has 7 candies, and he receives 3 more from his sister. How many candies does he have in total?

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Emily has twice as many red marbles as blue marbles. If she has 4 blue marbles, how many red marbles does she have?

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A box contains 9 yellow and 5 green pencils. What is the total number of pencils in the box?

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There are 10 students in a class. If half of them are girls, how many boys are there?

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Mary has 6 cookies, and she eats one-third of them. How many cookies does she eat?

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A farmer has 8 cows, and half of them are grazing in the field. How many cows are in the field?

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Jack has 3 times as many blue balloons as red balloons. If he has 2 red balloons, how many blue balloons does he have?

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There are 15 birds on a tree, and 2 fly away. How many birds are left on the tree?

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