All the teachers and students of an experimental primary school extended a helping hand in the activity of "Love to Lushan Earthquake-stricken Area in Ya'an". The fifth grade teachers and students donated a total of 1450 yuan, and the total donation of the sixth grade teachers and students was 50 yuan less than the 1.2 times of the fifth grade. How much did the fifth and sixth grade teachers and students donate in total?
某实验小学全体师生在"雅安芦山地震灾区献爱心"的活动中，纷纷伸出援助之手．五年级师生共捐款1450元，六年级师生捐款总数比五年级的1.2倍少50元．五、六年级师生共捐款多少元？
<gadget id="calculator">1_450 * 1.2</gadget>
<output>1_740</output>

<gadget id="calculator">1_740 - 50</gadget>
<output>1_690</output>

<gadget id="calculator">1_690 + 1_450</gadget>
<output>3_140</output>

<result>3_140</result>