The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: find the least number must be subtracted from 105829 so that remaining no . is divisible by 21 ?
[EX A]: 10

[EX Q]: Problem: in a forest 150 deer were caught , tagged with electronic markers , then released . a week later , 50 deer were captured in the same forest . of these 50 deer , it was found that 20 had been tagged with the electronic markers . if the percentage of tagged deer in the second sample approximates the percentage of tagged deer in the forest , and if no deer had either left or entered the forest over the preceding week , what is the approximate number of deer in the forest ?
[EX A]: 6,000

[EX Q]: Problem: in what ratio must rice of rs . 16 per kg be mixed with rice of rs . 24 per kg so that cost of mixture is rs . 18 per kg ?
[EX A]:
3 : 1