Please help me with this question

i’ve tried 2, 4, 8, -8, 0 and none of those answers worked

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Bradley hikes 12 miles in 3 hours. in relation to bradley’s hike, which statement describes the expression

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?