PQRS is a quadrilateral and M is the midpoint of PS. PQ = a, QR = b and SQ = a – 2b. Show that PS = 2b.

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Aefg - almn. find the ratio of aefg to almn. a)1: 4 b)1: 2 c)2.1 d)4: 1

Can someone tell me if this is perpendicular? !