**Ans 1.**Let the three consecutive odd number be ( x + 1) ,( x+ 3) , ( x+ 5) ;

then, 3 ( x+ 1) = 2 ( x + 5) + 3 => x = 10

Hence, the second number = 10 + 5 = 15

**Ans 2.**Let the digit at the ten's place be x;

**Ans 3.**

**Ans 4.**Let the number be 10x + y; then

**Ans 5.**

**Ans 6.**Let the two number be x and y; then

**Ans 7.**

**Ans 8.**

**Ans 9.**

**Ans 10.**

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