The average height of 10 children is 1.5 meters, some of them are below 1.4 meters, their average height is 1.2 meters; others are higher than 1.4 meters, their average height is 1.6 meters. So how many people are at most exactly 1.4 meters tall.
10个小朋友的平均身高是1.5米，其中有一些低于1.4米的，他们的平均身高是1.2米；另一些高于1.4米的，他们的平均身高是1.6米．那么最多有多少人的身高恰好是1.4米．
<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">10 - 1 - 6</gadget>
<output>3</output>

<result>3</result>