Add: I have 8 and I need 15 more, The total was 15 and then it increased by 8., Find 8 more than 15., What is 8 and 15 altogether?, What is the sum of 8 and 15?, Subtract: I have 8 and I need 15 altogether, The total was 15 and then it decreased by 8., What is the difference between 8 and 15?, Find 8 less than 15., What is the difference between 15 and 8?,

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