What is ANDI ?

If x=(1)/(20.21)+(1)/(21.22)+...+(1)/(29.30)andy=(1)/(30.31)+(1)/(31.32)+...+(1)/(39.40) , Then what is the value of (x)/(y) ?

Sandy and Mandy do (8/13) th part of a work and the rest of the work was completed by Andy. If Sandy, Mandy and Andy take the same work for Rs. 2600. then what is the share (in Rs.) of Andy?

Andy has twice as many marbles as Pandy, and Sandy has half as many has Andy and Pandy put together. If Andy has 75 marbles more than Sandy. How many does each of them have?

Andy has twice as many marbles as Pandy, and Sandy has half as many has Andy and Pandy put together. If Andy has 75 marbles more than Sandy. How many does each of them have?

When acids and alkalis react together,_____and______is formed .

The number of shirts with Andy is four more than half the number of shirts with John. If John has s shirts, then which of the following expressions is 'equivalent' to the number of shirts with Andy?