If 20% of the students played in the band in the band has 40 members how many students are there

So, start by doing .2x=40 (turn 20% into a decimal)
then multiply by 5
=200

2.4+3.2t. you get the answer by adding the ones with variables and ones without

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post