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Math problem of climbing stairs in primary school
3 minutes can climb 26*3=78, 4 minutes can climb 26 * 4 =104;

Climbing in B5 minutes 14*5=70, climbing in 6 minutes14 * 6 = 84;

So the stairs are 78 -84. (Because Grade A below 78 will arrive upstairs in 3 minutes, and Grade B above 84 will not arrive upstairs in 6 minutes).

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