Question 763419
1/2 a cup for 1 tsp of flavour
so, 3/4 of a cup for  1 1/2 tsp flavour
..............
25% of 24 boys = 6 boys
Now 18 boys on bus
10% of 20 girls = 2 girls
Now 22 girls on bus
New Total = 18 + 22 = 40
Old total = 24 + 20 = 44
So a decrease in the travellers.
..............
Recipe requires 3/4 cups of sugar and 1/8 cups of butter.
Alice puts in 1 cup of butter (8 x as much)
So, she will require to add 8 * 3/4 cups of sugar.
6 cups.
Hope this helps.
:-)