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15. If two quantities are related in such a way that when 1 quantity increases, the other quantity decreases, then this variation is said to be A extreme proportion B. joint proportion C. direct proportion D. inverse proportion 16. The price of 20 books is P1000. The price of 45 such books should be A. 4540 8.2250 C.1500 D.1750 17. Jamaica spends P30 everyday, but on Sunday, he spends P10 only. The ratio of amount spent on Sunday to everyday should be A 3:1 B.1: 3 C.35 D.2:1 18. Symbolically the proportion of a, b, c, d is written as A a: bc:d B. a + b c d Ca+b=c+d Da-b=c-d 19. There are 480 students in a school, 210 out of them are boys. The ratio of girls to the boys 15 C.7:9 D.9:7 B.7: 3 A 5:11 20. The ratio of a and b should be written as A ab B.a + b chta Db:a uivalence of two ratios is known as
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