A bar of steel weighs twice the mass of a bar of tin. If a steel bar also weighs 20 kgs more than a copper bar and a copper bar weighs 90 kgs, calculate the total weight of a container with 20 bars of each type of metal.
The total weight of 20 bars of copper is 20*90 = 
<gadget id="calculator">20*90</gadget>
<output>1_800</output>
1800kgs.
If a copper bar weighs 90 kgs, and a steel bar weighs 20 kgs more than a copper bar, the weight of a steel bar is 90+20 = 
<gadget id="calculator">90+20</gadget>
<output>110</output>
110 kgs.
If a bar of steel weighs 110 kgs, 20 bars will weigh 20*110 = 2200kgs.
The total weight of 20 bars of copper and steel is 2200+1800 = 
<gadget id="calculator">2200+1800</gadget>
<output>4_000</output>
4000 kgs.
A bar of steel weighs twice the mass of a bar of tin, meaning a bar of tin weighs 110/2 = 
<gadget id="calculator">55</gadget>
<output>55</output>
55 kgs.
The total weight of 20 bars of tins is 55*20= 
<gadget id="calculator">55*20</gadget>
<output>1_100</output>
1100 kgs.
The total weight of 20 bars of each metal is 4000+1100 = 5100 kgs.

<result>5_100</result>