7.69% of 130 + 6.66% of 150 = ?1). 202). 213). 224). 23
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10+10 = 20 (7.69% = 1/13 and 6.66%=1/15)
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1. 600 students took the test on Physics and chemistry. 35% students failed in Physics and 45% students failed in chemistry and 40% of those who passed in chemistry also passed in Physics, then how many
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