In a survey of 400 students, 80% said they had math homework every night. of these, 40% had writing homework every night. how many students had both math and writing every night?
a. 50
b. 128
c. 160
d. 320

Need on this geometry question. explain how you did it.

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.

  cassidy wants to cut the yellow fabric into strips that are 0.3 yards wide. how many strips of yellow fabric can cassidy make? yellow fabric 16 yards for $108.00.