Infosys Company Numerical Ability LCM and HCF

What is the median of 4/5,2/7,9/13,6/11,5/9

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A man bought 15 mango at Rs.36 for 5 mango and sold all of them at four mango for Rs.45. How much did the man earn or lose in this transaction? A Railroad Company has to transport raw materials from Industry X to destination Y. The industry X can have a maximum of 75 cars in its loading track.
The Railroad has 2 types of cars. Type A car requires $120 worth of fuel per trip between Industry X and destination Y, whereas B requires $210 per trip. The maximum weight a Type A car can handle is 130 Tons. Type B car can handle 200 Tons. The locomotive can handle 14000 Tons for the entire train. Length of Type A car is 70 foot and Length of Type B Car is 90. Max length the Train can handle is 7000 ft.
How many cars of each type will the Customer order from Industry to transport maximum Tons with least Fuel spent