What is the fraction 19/30 written as a decimal

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

In a rectangle klmn, km = 6x + 16 and ln = 49. find the value of x

Alistair has 5 half-pounds chocalate bars. it takes 1 1/2 pounds of chocalate,broken into chunks, to make a batch of cookies. how many batches can alistair mke with chocalate he has on his hand?