A shop is sending out a bill for an amount less than #100.the accountant interchange the two digits and so overcharage the customer by #45,given that the sum of the two digits is 9.find how much the bill should be?.thanks
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a + b = 9
------------------
b a - a b = 45
10 b + a - 10 a - b = 45
9 b - 9 a = 45
b - a = 5
-----------------------
so
+a + b = 9
-a + b = 5
____________ add
2 b = 14
b = 7
then a = 2
so maybe 27 or 72?
well he overcharged by 45
so I suppose it should have been 27 and he chargesd 72
how did u got 27 and 72 i don,t understand
the number is a b or b a
b = 7 and a = 2
so
7 2 or 2 7