The ratio of the number of boys to the number of girls in a
school of 1,200 Students is 7:5. If 20 boys are newly
admitted in the school, find how many new girls may be
admitted so that the above ratio may change to 4: 3.
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Step-by-step explanation:
Out of 1200 students
boys : girls = 7: 5
boys + girls = 1200
7 : 5 = 1200
1200 ÷ (7+5) = 100
boys = 700
girls = 500
New boys admitted is 20
therefore 700 +20 : girls = 4 : 3
Total girls with admitted in school is 540
New admitted girls = 540 - 500 = 40
40 new girls are admitted in school
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