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Solutions
Milk in the mixture of Sliter=3/5 * S=3S/5 liter
Water=2/5 * S=2S/5 liter
(18 - 3S/5) / (12 - 2S/5 + S)=2/3
(90 - 3S) / (60 + 3S)=2/3
270 - 9S = 120 + 6S
15S=150
S=10 liter
Milk in 70 liter=7/10 * 70= 49 liter
Water in 70 liter=3/10 *70=21 liter
Milk in 10 liter=7/10 * 10=7 liter
Water in 10 liter=3/10 *10=3 liter
(49 – 7 + T) / (21 – 3 +T) = 2 /1
42 + T=36 + 2T
T=6 liters
(7x – 7/12 * 9) / (5x – 5/12 * 9 +9) = 7 /9
(28x – 21) / (20x + 21) =7 / 9
252x – 189 = 140x + 147
X=3
V=12x=12 * 3= 36 liter
V = 36 liter
Red=10 * 50/100 =5
Yellow=6
Green=3
Required probability (U)=5C2 + 3C2 / 14C2
(U) =10 + 3 / 91=1/7
U = 1/7
Surface area of the cube (W) =6 * 36 * 36=7776 cm2
W = 7776 cm2