Please help ASAP.
a torch and battery cost £2.50 all together.
the torch costs £1.50 more than the battery.
what fraction of the total is the torch?
give your answer in it's simplest form.

Farnesene is a sesquiterpene. how many different isomers arising from double-bond isomerizations are possible? g

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?

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)