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Activity: Let's Try This! Direction: Read the following research problems carefully and identify the Dependent, Independent, and Constant Variables. PROBLEM 3. Maria wanted to find out which of the two brands of bleach, A or B, is more effective in removing coffee stains from a white shirt. She made mixtures of the two bleaches with the same amount of water and soaked white shirts with the same size of stain into each mixture for two minutes. After soaking, she measured the size of the stain left on each shirt. INDEPENDENT cause VARIABLES DEPENDENT - effect CONSTANT​