a 2 digit number is such that the product of its digits is 20. if 9 is added to the number the digits interchange their places.find the number.
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20*1=20
10*2=20
5*4=20
so the number's digits are 4 and 5
so the number is either 45 or 54
if we add 9 in 54, we get 63
and if we add 9 in 45, we get 54
As we can clearly see, the number is 45.
10*2=20
5*4=20
so the number's digits are 4 and 5
so the number is either 45 or 54
if we add 9 in 54, we get 63
and if we add 9 in 45, we get 54
As we can clearly see, the number is 45.
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