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13) d = 500 dm³/mnt
w = 20 mnt
v = d × w
= 500 dm³/mnt × 20 mnt
= 10.000 dm³ ( D )

14) v = 600 m³
d = 30 m³/mnt
w = v ÷ d
= 600 m³ ÷ 30 m³/mnt
= 20 mnt ( B )

15) L1 = p × l = 7 × 14 = 98 cm²
L2 = ½ × a × t = ½ × 6 × ( 14 - 4 ) = ½ × 6 × 10 = 30 cm²
Lttl = L1 + L2 = 98 + 30 = 128 cm² ( B )

16) d = 42 cm
r = d ÷ 2 = 42 ÷ 2 = 21 cm
L = π × r²
= 22/7 × 21 × 21
= 1.386 cm² ( D )

17) V = ½ × a × ta × tp
= ½ × 5 × 12 × 21
= 630 cm³ ( C )

18) d = 14 cm
r = d ÷ 2 = 14 ÷ 2 = 7 cm
V = π × r² × t
= 22/7 × 7 × 7 × 50
= 7.700 cm³ ( B )