Hayley has $ 155 in savings, and her brother Hank has $230. Hayley is saving $10 each week, and her
brother is spending $15 each week. After how many
weeks will their savings accounts have the same
amount of money in them?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?