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Trigonometry hellllllpppppppp asap

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?