Four children Ratan, Ravi, Reshma and Rahul Were each asked to choose a number between -10 and 10. The numbers chosen were -9, -5, -2 and 7. The number that Ravi chose was equal to the sum of Ratan's number and Reshma's number. Reshma's number was greater than Ravi's number. What was Ratan's number?

-5

Step-by-step explanation:

Here, we want to get Ratan’s number

Ravi = Ratan + Reshma

Reshma> Ravi

Let us try out the numbers

Possible sums are -9 + 7

This is because it is the only sum that will give us a number that is present in the series

The numbers left are -5 and -2

Also, Reshma was greater than Ravi

-2 = -9 + 7

so we can see that Reshma’s number is 7 here as it is the one out of the 3 in the equation greater than -9

so Ratan’s number is the last number = -5

The number of people that attended in scientific notation is 2.25 x 10^5.

Step-by-step explanation: