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2014-09-25T19:11:39+03:00
A * B = 672
(A + 10) * B = 992
B = 672 : A
(A + 10) * (672 : A) = 992
(A + 10) * 672 = 992A 
672A + 6720 = 992A
- 992A + 672A = - 6720
320A = 6720
A = 6720 : 320
A = 21
B = 672 : 21
B = 32
2 5 2
2014-09-25T19:13:29+03:00
Ab=672
ax(b+10)=992
ab+10a=992
672+10a=992
10a=320
a=32
b=672:a=672:32=21
1 5 1