In a triangle, ∠1=60°∠1 is 15° greater than ∠2, what is the degree of ∠3?
在一个三角形中，∠1=60°∠1比∠2大15°，∠3是多少°．
<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<gadget id="calculator">60 + 45</gadget>
<output>105</output>

<gadget id="calculator">180 - 105</gadget>
<output>75</output>

<result>75</result>