Tim came second in Math. When his mother asked him how much he had scored, he answered that he got the sum of the first 9 even numbers. His mother immediately worked out the answer. How much had he scored in Math?
90
Explanation: Sum = (n x n) + n
Hence, 9 x 9 = 81 + 9 = 90
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I am soft and transparent. I am so small that you can keep me on your fingers. I have no light but I help you to see the beautiful world. I improve your vision only when I come in contact with you. Who am I?
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