Question 1070699
Jack has a piano lesson twice a week and Hannah has a piano lesson every other week.
 In a given term, Jack has 15 more lessons than Hannah.
 How many weeks long is their term?
;
let w = no. of weeks
{{{w/1}}} - {{{w/2}}} = 15
multiply equation by 2 cancel the denominators
2w - w = 30
w = 30 weeks