Question

the age of my sister is four more than my age sum of our ages is 20 find our ages

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Answer 1

Question :

the age of my sister is four more than my age sum of our ages is 20 find our ages

Answer :

$\sf\pink{given}$

• let my age be x

• sisters age is 4 more than my = x + 4

• sum of our ages is 20

$\longrightarrow\bf{ 20 = x + x + 4}$

$\longrightarrow\bf{ 20 = 2x + 4}$

$\longrightarrow\bf{ 20 - 4 = 2x }$

$\longrightarrow\bf{ 16 = 2x }$

$\longrightarrow\bf{ x = \dfrac{16}{2}}$

$\longrightarrow\bf{ x = 8 }$

• Therefore my age is 8

• Sisters age is x + 4

$\longrightarrow\bf{ 8 + 4 }$

$\longrightarrow\bf{ 12 }$