76 - Most of the information is irrelevant! Concentrate on how she can have celebrated her 7th birthday on the same day of the week as she was born on - it doesn't happen often!
77 - Read the question carefully! It reminds me of an old favourate about a plane crashing on the border of 2 countries ........!
78 - Needs a bit of maths I think! Work out how long you have to do the 2 laps at an average of 60mph, then work out how long you have already taken to do the 1st lap at 30mph!
79 - Think in terms of numbers instead of percentages - If the population is 100, how many speak French? How many speak English? So how many must speak both?
Hope they are helpful!