Numbers in the unit place is of a two digit
number is 3 more than that of its tenth
place. Product
of a number and the sum
of ite digit
70. What is the number ?
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Answer:
Let the ten's digit be x.
unit's digit=x+3
Sum of digits=x+3+x=2x+3
Number=10×x +x+3=11x+3
A.T.P.
11x+3×2x+3=70
22x²+33x+6x+9=70
22x²+39x-61=0
22x²+(61-22)x-61=0
22x²+61x-22x-61=0
x(22x+61)-1(22x+61)=0
x=1 or -61/22
No.=11×1 +3=14
ir,No.=-61/22×11+3=33.5
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