Five notebooks cost 50 000 dong. At the same unit price, how much do 10 cost?, 150 000 dong, 100 000 dong, 50 000 dong, Which equation represents direct proportion between x and y?, xy = k, y = x + k, y = kx, In y = 3x, what is the constant of proportionality of y to x?, 3, x, y, In s = 40t, what is the constant of proportionality of s to t?, 4, t, 40, In V = 100h, what is the constant of proportionality of V to h?, 100, 10, h, In d = 2r, what is the constant of proportionality of d to r?, 1/2, 2, r, Distance s in kilometres satisfies s = 60t, with t in hours. How far does the car travel in 3 hours?, 120 km, 60 km, 180 km, Susan pays 40 000 dong for 4 salad bags. At the same unit price, how much do 6 bags cost?, 24 000 dong, 60 000 dong, 80 000 dong, The number of socks y satisfies y = 2x, where x is the number of students. How many socks are needed for 4 students?, 8, 4, 6, One worker builds a fence in 8 hours. Assuming equal work rates, 4 workers need how long?, 32 hours, 2 hours, 4 hours

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