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8 months ago
Let the age of the sister= S;
the age of the brother= B.
So, the relationships are:
S= B + 10 •••> (1)
S + B= 32 •••> (2)
Therefore, we input the value of S in equation (1) in equation (2) first,
S + B= 32
B + 10 + B= 32
2B + 10= 32
2B= 32 - 10
2B= 22
B= 22/2
B= 11
then we substitute the value of B above in equation (1).
S= B + 10
S= 11 + 10
S= 21
Thus, the ages of the sister and the brother are 21 and 11 respectively.
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