1- Nine added to thrice a whole number gives 45. Find the number.
2. A number when added to its half gives 72. Find the number.
3. Find two consecutive natural numbers whose sum is 63.
4. A father is 30 years older than his son . In 12 years the man will be three times as old as his son. Find their present ages.
SOLVE WITH EXPLANATIONS
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ANSWER:
Let the number = x
thrice of the number =3x
nine added to it is = 9+3x
sum given = 45
according to the problem ,
9+3x=45
3x = 45-9
3x = 36
x = 36/3
x = 12
...... 9 added to thrice a whole number be 45
9 + 3x = 45
9+3 multiplied with 12 which means x be 45
9+36 =45
45=45
lhs =rhs
hence proved
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