Question 189966
Let x = number of cups of hot chocolate sold
then
20+x = number of cups of coffee sold
(20+x)-30 = number of cups of tea sold
or
x-10 = number of cups of tea sold
.
1.05(x-10) + 1.35(20+x) + 2.25x = 202.50
1.05x - 10.5 + 27 + 1.35x + 2.25x = 202.50
4.65x + 16.5 = 202.50
4.65x = 186
x = 40 (cups of hot chocolate)
.
Cups of coffee:
20+x = 20+40 = 60 (cups of coffee)
.
Cups of tea:
x-10 = 40-10 = 30 (cups of tea)