Jamir and his two friends Sarah and Julien, go to their school's swimming pool to swim. Jamir swims 20 more meters per day than Sarah, who swims twice the distance Julien swims. They go to the swimming pool the whole week, swimming the same distances as before. If Julien swam 50 meters, what's the combined distance for three of them for the whole week?
If Julien swam for the whole week, then the total distance in meters that he covered is 50*7 = 
<gadget id="calculator">50*7</gadget>
<output>350</output>
350 meters.
Sarah swam twice the distance covered by Julien, which is 2*50 = 
<gadget id="calculator">2*50</gadget>
<output>100</output>
100 meters.
Sarah's total for the whole week is 100*7 = 
<gadget id="calculator">100*7</gadget>
<output>700</output>
700 meters.
If Jamir swam 20 meters more than Sarah, he covered 100+20 = 
<gadget id="calculator">20+100</gadget>
<output>120</output>
120 meters.
Jamir's total for the whole week is 120*7 = 
<gadget id="calculator">120*7</gadget>
<output>840</output>
840 meters.
The combined distance for all of them is 840+700+350 = 
<gadget id="calculator">840+700+350</gadget>
<output>1_890</output>
1890 meters.

<result>1_890</result>