book Maths Puzzle Numerical Ability

A father is 4 time as old as his son. 5 years ago the sum of their ages was 70 find their present age.

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book Other Question

The owners manual for a string trimmer says that a 16:1 ratio of gasoline to 2-cycle oil must be used for its fuel. How many gallons would be needed to go with an 8oz. packet of oil. If one 1 gallon is equal to 128 ounces? how would you do this please show me {4a+2u+i=2
{5a+3u+2i=17
{ a-5u =3