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Step-by-step explanation:
a) Applying unitary method
Distance covered by the bike in 1 L = (2x+3y-4z)
Distance covered in 2.5 L = 2.5 ×(2x+3y-4z)
= (5x + 7.5y - 10z)
b) (2x+ 3y - 4z) km are covered in 1 L.
Therefore, petrol required to cover (10x+ 15y - 20z)
= (10x+ 15y - 20z)/(2x+ 3y - 4z) = 5(2x+ 3y - 4z)/(2x+ 3y - 4z)
= 5L
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