Liangliang and his father weigh 35kg and 70kg respectively. Liangliang stands 3 meters to the left of the fulcrum. How many meters should his father stand on the right side of the fulcrum to keep the plank level and balanced.
亮亮和爸爸的体重分别是35千克和70千克，亮亮站在距离支点3米的左侧，爸爸应站在距离支点右侧多少米处，才能使木板保持水平平衡．
<gadget id="calculator">35 * 3</gadget>
<output>105</output>

<gadget id="calculator">105 / 70</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>