The sum of two numbers is 40. The larger number is 10 more than twice the smaller number. Find the numbers

I’m confused on how to work the pie charts

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?