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Answer key- class 7 annual practice paper

 A nswer key SECTION A 3x − 5 = 2x + 7 ⇒ 3x − 2x = 7 + 5 ⇒ x = 12 → a 2³ × 4² = 8 × 16 = 128 → b 25% of 400 = 100, so new value = 500 → b 65...