Two different schools (a and b) have the same number of pupils. the ratio of the boys in school a and the boys in school b is 2: 1 and the ratio of the girls in school a and the girls in school b is 4: 5. find the ratio of the boys in school a to the girls in school a.

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Hii1977 cleaner shrimp are a species of shrimp that clean parasites from other organisms. fish allow the shrimp to eat the parasites in their mouth. the shrimp get a source of nutrition. the relationship between the shrimp and the fish is this association indicates that for the smaill aneser arecommensal,mutualistic,or parasitic for the begger one the anser are the shrimp and fish benefit each other , the shrimp harm the fish, or the fish do not benetit from the shrimp

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