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snorkeler
Each block from bin A is 4 inches tall, while each block from bin B is 5 inches tall. If 12 blocks are stacked on each other, including a blocks from bin A and B blocks from bin B, into a single column, is a>b?

(1) b>5
(2) The height of the column is less than 56 inches

a+b=12
a>b?

(1) b>5: sufic
b≥6: a+b=12, a≤6, thus a≤b

(2) The height of the column is less than 56 inches: insufic
column a+b=12 height<56={9 to 55}
a=10, b=2: 10(4)=40, 2(5)=10, 40+10=50; a>b
a=5, b=7: 5(4)=20, 7(5)=35, 20+35=55; a<b

Ans (A)
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