If b = 9 then the value of 10b is 90
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11
The number is 34 a + b = 7 a = 7 − b 10a + b + 9 = 10b + a 10(7 − b) + b + 9 = 10b + 7 − b 70 − 10b + b + 9 = 9b + 7 72 = 18b 4 = b 3 = a
10b
9
a=7 b=9 ab=? ab is the multiplication of a & b there fore the value of ab=7*9=63