Claire's three sons, from oldest to youngest, are evan, joel, and alex. the difference between the ages of evan and joel is the same as the difference between the ages of joel and alex. if the sum of the three ages is 39, how old is joel?

Atemperature of 1.64◦f corresponds to answer in units of ◦c.

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?

Edger needs 6 cookies and 2 brownies for every 4 plates how many cookies and brownies does he need for 10 plates