book Maths Puzzle Numerical Ability

3 over 7 x = 15

solve for x

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book Other Question

You have 25 pounds of wheat and 5 pounds of sugar. To bake each loaf of bread, you need to use 1.3 pounds of wheat and 0.5 pounds of sugar. To bake each muffin, you need 0.4 pounds how do u work out a pecentage of a number such as 5% of 80 or 25& of 100
i already know the easy ones like 50& and 25% but what are the other ones?