The most commonly used base is 10,
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A Chinese abacus is called a Suan Pan. It works because it is based upon the decimal system, so the beads are used to count groups of ten.
The number works out as 9
The number works out as 14
Police 112 or 113 works on mobiles and landlines Fire 115 works on mobiles and landlines Ambulance 118 works on mobiles and landlines
Not too sure about your question but let the number be x:- If: 7x+8 = 50 then x works out as 6 But if: 7x = 42+8 then x works out as 7 and 1/7