A number is expressed by 2 digits, whose sum is 8, with a decimal point between them, and it's double is one less that the number obtained by interchanging the digits. What is the number.
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1
Answer:
The 2 digit number whose sum is 8 is 4.4
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Answer:
Let the 2 digit number be ab
sum is 8 ie. a+b=8
Decimal point between them ie a.b
double is 1 less than the interchanging of the digit ie.
a.b×2 = 1 - b.a
For 2 digit decimal number add up and give the sum as 8 possible pairs are (2.6) (1.7) (5.3) (5.2)
Except the 1st pair other pairs don't fulfill the conditions in the question. ie.
2.6 × 2 = 5.2
5.2 = 1 - 6.2
Thus 2.6 is the number.
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