bonjour
1)
1/3 jardin = piscine
4 m² de local technique
S - 1/3 S - 4 = 380
S (1-1/3) - 4 = 380
2/3 S = 384
S = 576 m²
=> piscine : 192 m²
et 576 - 192 - 4 = 380 m²..
2)
1/3 de 384 + x hommes + 4 = 384
128 + x + 4 = 384 => x = 252 hommes
3)
1ere pers = 1/3 de S = 1/3S
2ème pers = 380
3ème pers = 1/3 S + 4
1/3S + 380 + 1/3S + 4 = S
S (1/3) = 384
S = 1 152 €