Question

Nea Alecu a turnat 2250 de litri de lapte in 4 bidoane, astfel: in al doilea- jumatate cat primul, in al treilea- jumatate cat al doilea, iar in al patrulea- jumatate cat in al treilea.
Cati litri de lapte sunt in fiecare bidon?
( dau coroana)

Answer 1

a,b,c,d= cele patru bidoane
b=a:2  => a=2b
c=b:2  => b=2c
d=c:2  => c=2d
2b+2c+2d+d=2250
2x2c+2x2d+3d=2250
4c+4d+3d=2250
4x2d+4d+3d=2250
8d+4d+3d=2250
15d=2250
d=2250:15  => d=150 litri
c=2d  => c=2x150  => c=300 litri
b=2c  => b=2x300  => b=600 litri
a=2b  => a=2x600  => a=1200 litri
a+b+c+d=2250  => 1200+600+300+150=2250 litri