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4 years ago

A knife is three times the cost of a spoon.

Mathematics

1 answer:

ivanzaharov [21]4 years ago

7 0

Answer:

cost of knife = £5.52

Step-by-step explanation:

Assume:

Cost of Knife = a

Cost of Spoon = b

a = 3b ----------------------(1)

12a + 9b = £82.80 -------(2)

Substitute equation (1) in equation (2)

12 * (3b) + 9b = £82.80

36b + 9b = £82.80

45b = £82.80

b = £1.84

Therefore, cost of knife = a = 3 * £1.84 = £5.52

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