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use mental math to find each value 5% rebate on a $150 cell phones

A and B are two alloys of gold and copper,prepared by mixing metals in the ratio 7:2 and 7:11 respectively.if equal quantity of alloys are melted to form a third alloy C.find the ratio of gold and C show working thanks GOD bless

A two digit number is less than six times the sum of it digit by 1.The difference between the digit is 1. Find the number??