Question

1 kg of prawn cost as much as 1.5 kg of crabs.Mrs Lee paid $140 for 3 kg of prawns and 6 kg of crabs.What was the cost of prawn?

Answer 1

Answer:

$20

Step-by-step explanation:

1 Kg prawn is same as 1.5 kg crab

so, 6 kg crab is equal to 4 kg prawan

so total 7 kg prawn cost $140

so 1 kg prawn costs $20

Answer 2

Answer:

19.95

Step-by-step explanation:

let prawn be x

crab be y

x=1.5y

3x+ 6y = 140

3(1.5y) + 6y = 140

4.5y + 6y = 140

y = 13.3

x = 1.5*13.3

x = 19.95