Self Maths Puzzle Category

+6 - 22 * 3 - 8..??

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Self Other Question

926:24
799:72
956:?
A shopkeeper buys some pens. If he sells them at Rs. 13 per pen, his total loss in Rs. 150 but on selling them at Rs. 15 per pen, his total gain is Rs. 100. How many pens did he sell?