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20 = 5n
n=4
maka a = 2 * 4 =8
b = 3 * 4 = 12
a = 2x
b = 3x
L = 1/2 × (a + b) × t
60 = 1/2 × (2x + 3x) × 6
60 = 1/2 × 5x × 6
60 = 15x
4 = x
a = 2x
= 2(4)
= 8 cm
b = 3x
= 3(4)
= 12 cm