Answer 3rd and 4th question . For your confusion answer of 3rd question is 7m and answer of 4th question is 6264cm ^3
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Step-by-step explanation:
3.Surface area of cube=6a^2
294=6a^2
a^2=49
a=7m
4.External length= 30 cm
External breadth = 25 cm
External height = 20cm
External volume=30×25×20 = 15000 cm³
Therefore, Internal volume of the cuboid = (26 × 21 × 16) cm³
= 8736 cm³
Volume of wood = External Volume - Internal Volume
= 15000 cm³ - 8736 cm³
= 6264 cm³
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