850 - (1500 ÷ ?) × 8/15 = 770
Options:  A) A)31  B) B)10  C) C)15  D) D)26  E) E)17
Explanation:   =&gt; 850 - (1500 ÷ ?) × 8/15 = 770   =&gt; 850 - 770 = (1500 ÷ ?) × 8/15   =&gt; 80 = (1500 ÷ ?) × 8/15   =&gt; 80 × 15/8 = (1500 ÷ ?) = 150   =&gt; 1/? = 150/1500 = 1/10   =&gt; ? = 10   Answer: Option 10
<result>B</result>
850 - (1500 ÷ ?) × 8/15 = 770