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## Question

secondary 2 | Maths

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unit digit: x

tens digit: y

x+y = 12 ... ... ... [1]

x = 2y ... ... ... [2]

subst. [2] into [1],

3y = 12

y = 4

x = 8

number is 48

...

[ extra: use pri method ]

unit digit : 2u

tens digit : u

2u+u = 12

u = 4

no. is 48.

...

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