Master Zhang went to the store to buy rice. Due to the negligence of the salesperson, he was given 10 catties less rice, but he was charged 36 yuan, which is known to be 1.2 yuan per 3 catties of rice. Ask the salesperson how much rice he gave Master Zhang?
张师傅去商店买大米，由于售货员疏忽，少给了他10斤大米，但收了他36元钱，已知每3斤大米1.2元．问售货员给了张师傅多少斤大米？
<gadget id="calculator">1.2 / 3</gadget>
<output>0.4</output>

<gadget id="calculator">36 / 0.4</gadget>
<output>90</output>

<gadget id="calculator">90 - 10</gadget>
<output>80</output>

<result>80</result>