Dongfang Primary School carried out the activity of "Loving the Disaster Area and Giving Love", in which the fifth grade donated 690 yuan, which was 1/4 less than that of the sixth grade. How much did the fifth and sixth grades donate?
东方小学开展"情系灾区，献爱心"活动，其中五年级捐款690元，比六年级少捐(1/4)．五、六年级共捐了多少元．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">690 / (3/4)</gadget>
<output>920</output>

<gadget id="calculator">920 + 690</gadget>
<output>1_610</output>

<result>1_610</result>