tolong dijawab dengan serius yia dengan cara lengkap tq..

Question No. 8

1 SGD = 0,816 USD
1 AUD = 1,073 USD

a. AUD/SGD = ?

[tex] \frac{AUD}{SGD}= \frac{1,073}{0,816} =1,315 [/tex]

1 AUD = 1,315 SGD

b. 25.000 AUD = (1,315 × 25.000) SGD
    25.000 AUD = (1.315 × 25) SGD
    25.000 AUD = 32.875 SGD

Question No. 9
Price per litre of Peanut Oil = x
Price per litre of Olive Oil = y

2x = $15
2,5y = $30

a. 2x = $15 ⇒ x = $15 ÷ 2 litre ⇒ x = $7,5 / litre

b. 2,5y = $30 ⇒ y = $30 ÷ 2,5 litre ⇒ y = $12 / litre

c. Ratio x : y
    x : y = 7,5 : 12 ...........both sides multiplied with ²/₃
    x : y = 5 : 8

d. Better buy is Peanut Oil, because the price per litre is more cheap than Olive Oil

e. Consumption rate of Peanut Oil
= 2 litres ÷ 16 days
= ¹/₈ litre / day
= 0,125 litre / day

f. The time of consumption of Olive Oil with rate 0,125 l/day
= 2,5 litres ÷ 0,125 litre/day
= 2,5 litres ÷ ¹/₈ litre/day
= 2,5 litres × 8 days/litre
= 20 days

Question No 10
Travel Time = 4,5 hours
Mileage = 360 km
Patrol Consumption = 37,5 litres

a. Average Speed
v = Milage ÷ Travel Time
v = 360 km ÷ 4,5 hours
v = (360 ÷ ⁹/₂) km/hour
v = (360 × ²/₉) km/hour
v = (40 × 2) km/hour
v = 80 km/hour

b. Petrol Consumption Rate
Petrol CR = 350 km ÷ 37,5 litres
Petrol CR =  9,333 km/litre = 9 ¹/₃ km/litre

c. Average Speed for the remaining part of journey 
v₁ = 110 km/h
t₁ = 2 hours

m₁ = Average Speed × Travel Time
m₁ = 110 km/h × 2 h
m₁ = 220 km

Remaining part :
m₂ =  M - m₁
m₂ = 350 km - 220 km
m₂ = 130 km

t₂ = T - t₁
t₂ = 4,5 h - 2 h
t₂ = 2,5 h

v₂ = m₂ ÷ t₂
v₂ = 130 km ÷ 2,5 h
v₂ = 52 km/h

***Hopefully Helped***