Question

1)in trei vase sunt 865 litri de ulei in vasul al 2 se afla cu 360 litri mai mult decit in 1 vas.iar in all 3 vas sint cu 58 de litri mai mult ca in al 2 vas.citi litri de ulei sunt in fiecare vas....urgent pn olimpiada...varog mult

2)aflati suma a+b+c+d daca se stie ca A = 2568.,B= 1\6 din A, C =3\4 din B si din D= 5\7 din B+C

3)La o ferma sunt vaci si gaini,in total sunt 252 de picoare si 98 de capete,cite vaci si cite gaini sunt la ferma?

4)Calculati.(16.5 - 13.6) ÷ 0,25 + (8\33-1\11) × 0,125 va rog mult...pn olimpiada
VA ROOOOGGGG URRRRRRGENNTTTTT.....

Answer 1

1) a=primul vas
b=al 2 lea vas
c=al 3 lea vas

a+b+c=865
b=a+360
c=b+58
c=a+360+58
c=a+418

a+a+360+a+418=865
3×a+778=865
3×a=865-778
3×a=87

a=29 litri
b=29+360
b=389 litri
c=389+58
c=447 litri

2) a=2568
b=1/6 ×a
b=1/6×2568
b=428
c=3/4×b
c=3/4×428
c=3×107
c=321
d=5/7×(b+c)
d=5/7×(428+321)
d=5/7×749
d=5×107
d=535

a+b+c+d=2568+428+321+535
=2996+856
=3852

3) vaci=4 picioare
gaini=2 picioare
g+v=98
g×2+v×4=252
g+v×2=126
(g+v×2)-(g+v)=g+v×2-g-v=v=126-98=28
v=28
g=98-28
g=70

4)
$(\frac{165}{10} - \frac{136}{10} ) \div \frac{25}{100} + ( \frac{8}{33} - \frac{1}{11}) \times \frac{125}{1000} =$
$\frac{129}{10} \times \frac{100}{25} + ( \frac{8}{33} - \frac{3}{33} ) \times \frac{125}{1000} =$
$\frac{12900}{250} + \frac{5}{33} \times \frac{125}{1000} =$
$51.6 + \frac{625}{33000} =$
$51.6 + \frac{1}{52.8} = \frac{2724.48}{52.8} + \frac{1}{52.8} = \frac{2725.48}{52.8}$