Mackerel 6531

Mackerel costs m euros. If you buy mackerel and 20 sardines, you will pay double. How much will you pay for:

(a) mackerel and 40 sardines
(b) three mackerel and 80 sardines

Correct answer:

a = 3m
b = 7m

Step-by-step explanation:

m+20s = 2m 20s = m s = m/20 a = m + 40s = m+ 40/20m a=3m
b=3m+80 m/20=3m+4m b=7m

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