Seals

There are 10 seals on floe.
a) On Wednesday arrived a six and departed 2 seals. How many seals are on the floe?
b) on Thursday arrived a 5 seals more then departed. How many seals are on the floe?

Correct result:

a =  14
b =  19

Solution:

$a=10+6-2=14$
$b=a+5=14+5=19$

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