3/4×36. 30×13/10. 9/8×32 1/2×60. 3/4 ×60. 3/10×1000. 4/5×100
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You would need 105 of sodium I found how much increase there was from 30 to 75 by doing 75/30 which is 2.5 that means the new amount of sodium would be 2.5 times 42 which is 105. You could also set up ratios and cross multiply like the picture I sent
