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a + b = 100 .... (1)
1 decena = 10
a - b = 20 ....(2)
(1) + (2)
a + b = 100
a - b = 20
_________
2a = 120
a = 60
En (2) :
a - b = 20
60 - b = 20
60 - 20 = b
b = 40