memory based problems ibps clerk

Simplification: 1. ?÷60-3/4= 3 1/3 2. ?% of (152÷19×45)=126 3. 46% of 600+ 44% of 225=? 4. 12×9÷?×15= 16+38 5. ?÷12×4/0.6=250 6. ?+0.4= (1.6+5.4)÷2.5