While michelle sat observing birds at a bird feeder, one fourth of the birds flew away when they were startled by a noise. two birds left the feeder to go to another stationed a few feet away. three more birds flew into the branches of a nearby tree. four birds remained at the feeder. how many birds were at the feeder initially?

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

What is the lcm of 16 and 40 ? 24 and 40 ?

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?