Camel

Subtract these first

cow+sheep=240

cow+dolphin=215

Ans ------ sheep-Dolphin=25

then add these-

camel-sheep+dolphin=455

sheep-dolphin=25

ans----- camel=480 (455+25)

Let cow=w goat=x fish=y and camel=z . . Thus we hav, [w+x=240--(1) y+z=500--(2) z-x+y=455--(3) w+y=215--(4) . . Here v hav 2 find d value of z. . .] adding (1) and (4) ; 2w+(x+y)=240+215 which is =455 i.e, 2w+(x+y)=455--(5) since rhs of (5) and (3) are equal, v cud equate lhs f deze 2 eqnz. . i.e. , 2w+x+y=z-x+y by rearranging, v get, z=2(w+x) sinc v hav d value f (w+x) as 240 4m d equatn (1) , z=2*240=480 and hence CAMEL=480