Morita works in a florist shop and makes flower arrangements. she puts 10 flowers in each vase, and 2/10 of the flowers are daisies. if morita makes 4 arrangements, how many daisies does she need?

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?