pr; 21
630-48-57-63=462 suma partilor egale
462÷3=154 numarul
154+48= 202 primul numar
154+57= 211 al doilea numar
154+63= 217 al treilea numar
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pr;22
suma a doua numere este 157 primul numar se cuprinde in al doilea numar de 4 ori si mai ramine restul 7
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/-------/ }
/------/-------/---------/-------/---7 }157
154-7=150
150÷5=30 primul numar
30×4+7=120+7=127 al doilea numar
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pr;23
a+b=792
a-24=b+24
a-b=48
2a+b-b=792+48
2a=840
a=840÷2
a=420l in prima cisterna
420+b=792
b=792-420
b=372l in a doua cisterna
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pr;24
oana-a, anita-b
5b=a
a-220=b+220
5b-220=b+220 /+220
5b=b+440
4b=440
b=440÷4
b=110 poze are anita
5×110=550 poze are oana
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