Fri November 30, 2012 By:

A number consist of two digit whose product is 30. if unit's digit is subtracted from ten's digit, 1 is obtained,find the number.

Expert Reply
Sat December 01, 2012
let unit digit=X
Therfor ten's digit=X+1
now, X*(X+1)=30
or, X^2+X-30=0
or, X^2+6X-5X-30=0
or, X(X+6)-5(X+6)=0
or, (X-5)(X+6)=0
or, X=5 or -6
X can not be -6.
ther for X=5
Therfor, number=65
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