"Betty bought some butter but the butter was too bitter, so she put a little gummy to make the bitter butter yummy." In the above sentence, if you replace every letter 't' with letter 'b', what is the total number of instances in which the same letter appears at least twice in a word?

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Q1.A painter mixes white and black paints to create different shades in two different buckets. He prepares 10 kg in one bucket with 20% black paint in it. He then prepares 20 kg of another shade in the second bucket with 20% black paint in it. He pours the second bucket into the first one. What is the percentage of black paint in the mixture?