Are these ratios equivalent? In a cake recipe, 500 grams of butter are mixed with 800 grams of flour. In a cake recipe, 125 grams of butter are mixed with 200 grams of flour. Two ratios are equivalent if their cross products are equal. Write the ratios as fractions.

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Are these ratios equivalent? A builder mixes 10 shovels of cement with 25 shovels of sand. A builder mixes 5 shovels of cement with 15 shovels of sand. Two ratios are equivalent if their cross products are equal. Write the ratios as fractions.