標題:
maths f.3
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發問:
the ratio of hte radius of metal ball a to that of the metal ball b is 2:3.after melting the two metal balls,all the metal is used to recast metal ball c. if the volume of metal ball b is 441pi /10 cm^3,find the radius of metal ball c. 點解AND 點做
最佳解答:
Let y cm^3 be the volume of metal ball a (2/3)^3=y/44.1pi 8/27=y/44.1pi y=196pi/15 cm^3 Let r cm be the radius of metal ball c 4/3 ×pi ×r^3=196pi/15+441pi /10 r^3=42.875 r=3.5 ∴The radius of metal ball c is 3.5cm
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