Answer:
105kg
Step-by-step explanation:
B + B + B = 12kg
3B = 12kg divide both sides by 3
B = 4kg
Substitute to T + B = 5kg:
T + 4kg = 5kg subtract 4kg from both sides
T = 1kg
Substitute to J - T = 99kg:
J - 1 = 99kg add 1 to both sides
J = 100kg
Therefore:
J + B + T = 4kg + 1kg + 100kg = 105kg
