Commercial, Mathematics

The C.P. of 20 articles is same as theS.P. of x articles.Article profit is 25%.Find x
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Peter was 60 inches tall on his thirteenth birthday. By the time he turned 15, his height had increased 15%. How tall was Peter when he turned 15? Find 15% of 60 inches and add

How could 2+2 will be Equal to 5

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verify liouville''s theorem for y''''''-y''''-y''+y=0

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