Please help thank you pic down below

For each proportion find the unknown number x 1/5/8=×/15

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)