6 farmers collected a total of 84 kilograms of mushrooms and put them in 4 baskets. 15 kilograms were put in the first basket, and the rest were put in 3 baskets on average. How many kilograms of mushrooms were put in each basket?
6个农民共采84千克蘑菇，装在4个筐内，第1筐里放了15千克，剩下的平均装在3个筐内，每筐放了多少千克蘑菇？
<gadget id="calculator">84 - 15</gadget>
<output>69</output>

<gadget id="calculator">69 / 3</gadget>
<output>23</output>

<result>23</result>