Deers and roes live in the forest. Deers make up 30% of the forest life. There are 144 deers less than roes. How many roes live in the forest? Answer: 252 roes. How do I solve this problem?

1 Answer
Mar 10, 2016

Convert the problem into equations that can be solved for the number of roe.

Explanation:

If x is the number of roes, then the number of deer is x-144

If T is the total, then deer are 0.3*T

x+(x-144)=T
2x = T +144

x-144 = 0.3*T
x= (3T)/10 +144

Substituting, 2((3T)/10 +144) = T+144
(3T)/5 -T = 144 - 288
2T = 144*5 = 720

T = 360

x=108 + 144 = 252