Question

the ratio of number of doctors to that of nurses in a group become 2:1, when 15 nursess leave. but after-wards when 45 doctors also leave ,this ratio becomes 1:5.originally the number of nurses in the group was

Answer 1

Let the original number of nurses be x
Then, original number of doctors is 2x
Given,
$(2x - 45):(x - 15) = 1:5 \\ 5 \times (2x - 45) = 1 \times (x - 15) \\ 10x - 225 = x - 15 \\ 9x = 210 \\ x =23.33$

Since x is not an integer, pls check values given in ur question

Answer 2

hope it will help you