Answer:
<h2>105kg</h2>
Step-by-step explanation:
B + B + B = 12kg
3B = 12kg <em>divide both sides by 3</em>
B = 4kg
<em>Substitute to T + B = 5kg:</em>
T + 4kg = 5kg <em>subtract 4kg from both sides</em>
T = 1kg
<em>Substitute to J - T = 99kg:</em>
J - 1 = 99kg <em>add 1 to both sides</em>
J = 100kg
Therefore:
J + B + T = 4kg + 1kg + 100kg = 105kg
