If the cost of 2 dozen pens is Rs 600 how much more is the cost of 30 pens

Segment xz is bisected by point y. if xy = 12x, and the measure of xz = 18x – 6, solve for x

This is about circle theorems. someone asap : (

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.