, {q:”Average of 6 consecutive natural numbers=8.5. Largest?”,opts:[“11″,”10″,”12″,”9″],ans:0,topic:”Consecutive Numbers”,exam:”Bank/SSC”,explain:”6 numbers: avg=middle of 3rd&4th=8.5. 3rd=8,4th=9. Numbers:6,7,8,9,10,11. Largest=11.”,trap:”6 numbers: Largest=avg+2.5=8.5+2.5=11.”,trick:”Largest=avg+2.5=11″}, {q:”20 numbers avg=30. 5 numbers (avg=20) replaced by 5 numbers (avg=40). New average?”,opts:[“35″,”32.5″,”30″,”32″],ans:0,topic:”Average — Replacement”,exam:”Bank/MPSC”,explain:”Old sum=600. Remove 100, add 200. New sum=700. Avg=700/20=35.”,trap:”Net change=+100 | 700/20=35.”,trick:”(600-100+200)/20=35″}