Children with ADHD (attention deficit hyperactivity disorder) can be hyperactive which can make it difficult to get to sleep. Bedtime can also be chaotic and stressful for parents.
Rational Numbers 5/1, 1/2, 1.75, -97/3 ... A rational number is any number that can be written as a ratio of two integers (hence the name!). In other words, a number is rational if we can write it as a fraction where the numerator and denominator are both integers.
Ratio is 1/4 20, in total. The minimum numbers of math guys and others to give us the ratio of 10/11 are 10 math guys and 11 others. But we already have 16. so we multiply the ratio by 2, which means that we have to have 20 math guys and 22 others in order to have the ratio of 10/11.