a) 16
M / N = 2/5
M + N = 56
M = 56 - N
(56 - N) / N = 2/5
56 / N - N / N = 2/5
56 / N - 1 = 2/5
56 / N = 2/5 + 1
56 / N = 1.4
56 = 1.4 * N
56 / 1.4 = N
40 = N
M = 56 - 40
M = 16
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a) 16
M / N = 2/5
M + N = 56
M + N = 56
M = 56 - N
M / N = 2/5
(56 - N) / N = 2/5
56 / N - N / N = 2/5
56 / N - 1 = 2/5
56 / N = 2/5 + 1
56 / N = 1.4
56 = 1.4 * N
56 / 1.4 = N
40 = N
M = 56 - N
M = 56 - 40
M = 16