Can you please help me with the math problem

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.

Simplify 1 divided by 2/3 x (-3) divided by 1/6 x (-10)