exam Maths Puzzle Numerical Ability

Please help me!!!
1. You have 10 feet of yarn to use for making bracelets and necklaces. You need 1 foot for each bracelet and 2 feet for each necklace.

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exam Other Question

"A" and "B" start from the same point and travel along the road that are right angles to each other. "A" travels 3 miles an hour faster than "B". At the end of 2 hours, they are 30 miles apart. Find their rates. How much water should be added to 75 ml of pure lemon juice in order to get a mixture that is 20% lemon juice?
Please help, thanks!