Question 197383
4x+2(20-x)=20*2.50
4x+40-2x=50
2x=50-40
2x=10
x=10/2
x=5 kg of the $4 tea is used.
20-5=15 kg of the $2 tea is used.
Proof:
4*5+2*15=50
20+30=50
50=50