Find (220 + 330 + 440 + 550 + 660) mod 7.

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A: This is a problem of point-set topology.

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A: Please upload the multiple parts separately.I answered here first 3 sub-parts as per our policy.

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Q: Kindly answer this as soon as possible and solve only by step-by-step method. And d not write answer...

A: Given, if 2x=3y=5z=301x+1y+1z, To find                   2x+3y+5z30=?