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A pack of iron bolts is such that the difference in masses or weights of successive sizes is the same bolt being of mass

A pack of iron bolts is such that the difference in masses or weights of successive sizes is the same bolt being of mass 13.5 grams and the largest is 94.5 grams. If the total mass of the complete set is 70 grams. (i) Calculate the number of bolts in a set. (ii) The difference in the masses of the successive sizes.

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