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

Question

Bob · Accepted Answer

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Damon · Answer

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

edward · Answer

how did u got 27 and 72 i don,t understand

Damon · Answer

the number is a b or b a b = 7 and a = 2 so 7 2 or 2 7

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