The canteen shipped a batch of blue ink and red ink. The blue ink was 4 bottles more than (3/5) the total amount of this batch of ink, and the red ink was 2 bottles more than (1/3) the total amount of this batch of ink. How many bottles of ink are there in total?
小卖部运来一批蓝墨水和红墨水，蓝墨水比这批墨水总数的(3/5)多4瓶，红墨水比这批墨水总数的(1/3)多2瓶．这批墨水一共是多少瓶？
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (3/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">6 / (1/15)</gadget>
<output>90</output>

<result>90</result>