exam Maths Puzzle Numerical Ability

HELP! Ana, Bob, and Chris will not disclose their weights but agree to be weighed in pairs Anna and Bob together weigh 226 pounds. Bob and Chris together weigh 210 pounds. Anna and Chris together weigh 200 pounds. How much does each student weigh?

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exam Other Question

Consider a system consisting of a mass m suspended from a spring. When
stretched or compressed from its natural length the spring exerts a force that
tries to restore it to its a what are functions and what is domain and range? Can you give me an example to give me a better understanding?