Answer:
9 hours
Step-by-step explanation:
$56.00 -------> 7 hours
$1 ---------------> (7 / 56) hours
$72 -------------> (7/56) x 72 = 9 hours
To find Jenny's age as a percentage of her great grandmother's age :

i think this is the answer for n=-2/a+4
Let Liam's age= x
Max's age= 25
After two years Max's age= 25+2
After two years Liam's age= x+2
After two years Liam will be half of MAx's age,
So-

Liam's age after 2 years= 11.5 + 2= 13.5
Max's age after 2 years - 27
13.5 is half of 27 answer
Hope I helped~!