Resposta :
Vamos inverter a pirâmide:
| 15 | x | x | x | 16 |
| 15 + x | x + x | x + x | 16 + x |
| 15 + 3x | 4x | 16 + 3x |
| 15 + 7x | 16 + 7x |
| 2005 |
15 + 7x + 16 + 7x = 2005
14x + 31 = 2005
14x = 2005 - 31
14x = 1.974
x = 1.975 : 14
x = 141
Resposta: Letra B --- 141
| 15 | x | x | x | 16 |
| 15 + x | x + x | x + x | 16 + x |
| 15 + 3x | 4x | 16 + 3x |
| 15 + 7x | 16 + 7x |
| 2005 |
15 + 7x + 16 + 7x = 2005
14x + 31 = 2005
14x = 2005 - 31
14x = 1.974
x = 1.975 : 14
x = 141
Resposta: Letra B --- 141