Track / Stage 4 / 68 of 340 #328 of 1964

45. Now there are chickens and rabbits in a cage, with 30 heads above and 100 feet below. The number of chickens in the cage is $\qquad$ .

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A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.

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Official solution

answer: 10

Source: NuminaMath-1.5, licensed Apache-2.0. Statement and solution reproduced as published; topic, difficulty and ordering added by this site.