3.75% of what number is 93.75
3/4% of what number is .225
.7% of what number is .0385

3.75% of what number is 93.75
0.0375x = 93.75
x = 93.75 / 0.0375
x = 2500 <==

3/4% of what number is 0.225
0.75x = 0.225
x = 0.225 / 0.75
x = 0.3 <==

0.7% of what number is 0.0385
0.007x = 0.0385
x = 0.0385 / 0.007
x = 5.5 <==

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats