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The age of two friends is in the ratio 5:6,after how many years will the ages be in the ratio 7:8?

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TCS Other Question

From a rope a triangle is made of sides 21cm,24cm,28cm. from this a square is made. Find area of square. There r ten spots in library and each spot has 4 tables and ten readers ar there . 10 student come into liberary and want 2 study in how many ways that they sit in d liberary so that no chair would be blank?