Chemicals for the pool are sold in 2 kg packs for £25.80. It can also be bought in 20 kg bags for £199. What is the saving per kg when
buying in bulk?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

There are a total of 75 students in the robotics club and science club. the science club has 9 more students than the robotics club. how many students are in the science club?

Ahealth-food producer has 250 samples of a new snack to distribute in the mall. the producer has to keep at least 50 samples for display in the health food for the product launch. how long will the samples last if consumers are taking the samples at a rate of 25 every hour