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I got a family size box, net weight 6oz (170g), of Strawberry Jello about 2 months ago. I only needed 1/3 of a cup (41.7g) of the jello mix for something else I was making. So I kept the rest of the Jello mix to eventually use.

Today I want to make the remaining box of Jello to use in a Jello Poke Cake. How would I make the Jello so it sets like normal when there is only 128.3g of Jello mix? The box says it normally calls for 2 cups of boiling water & 2 cups of cold water.

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You basically have 3/4 of the box left. So that would mean you would use 3/4 of the amount of water, which equals 1.5 cups each of hot and cold water.

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    Just to add to your answer. There's 236g of water in a US cup. Which would mean for 128g of Jello powder, you'd need to use about 712g of water in total. Half of which (356g) would be boiling. Commented Apr 25 at 20:14
  • Scaling might be found to effect things marginally but this proportionate solution is the best starting point for any incremental adjustments if you ever have a call to repeat this activity. Commented Apr 27 at 23:50
  • The mathematically concept is called rule of proportion or rule of three for finding any amount of fractions you need during cooking Commented Apr 28 at 8:28
  • Extending this answer to any proportion remaining: [unknown] is to [full recipe] as [what's left] is to [full box], which simplifies to: [unknown] equals [full recipe] times [what's left] divided by [full box]. 2x128.3/170=1.5 (plus change, but we're preparing gelatin, not doing chemistry). Commented Jun 27 at 4:12

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