(Just list the formula (or equation), do not need to calculate) There are 900 boys in a certain school, which is 1/4 less than girls. How many boys and girls are there in total?
(只列式(或方程)，不必计算)某校有男生900人，比女生少(1/4)，男、女生共有多少人？
<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">900 / (3/4)</gadget>
<output>1_200</output>

<gadget id="calculator">900 + 1_200</gadget>
<output>2_100</output>

<result>2_100</result>