a student chose a number, multiplied it by 3, then subtracted 138 from the result and got 102. what was the number he chose?  Options:
A) 80  B) 120  C) 130  D) 140  E) 150
<gadget id="calculator">102 + 138</gadget>
<output>240</output>

<gadget id="calculator">240 / 3</gadget>
<output>80</output>

<result>A</result>
a student chose a number, multiplied it by 3, then subtracted 138 from the result and got 102. what was the number he chose?
divide(add(102, 138), 3)
"solution : let xx be the number he chose , then 3 ⋅ x − 138 = 102 3 x = 240 x = 80 answer a"