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2018 Ondo State Joint Promotion Mathematics (Maths) Free Answers Expo Questions Posted

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(12a)
Let X represent Bisi`s age and
Let Y represent Fibi`s age
:- x + y = 29 ———– eqn (i)
Seven years ago
(x – 7) = 2(y-7)
X – 7 = 2y – 14
X – 2y = -7 ————eqn (ii)
To get X and Y; We have ;
From equation (ii)
X = -7 + 2y
Substitute for X in eqn (i)
-7 + 2y + y = 29
3y = 29 + 7
3y = 36; y = 36/3 = 12
Substitute Y = 12 into eqn (i)
x +y = 29
x + 12 = 29; x = 29 – 12 =17
:- their present age are;
X = Bisi —-> 17 years
Y = Fibie —> 12 years

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