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Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

What percent of 18 is 24? and plz explain thx.