4. The first, second and third term of a proportion are 6, 10 and 9. Find its fourth term. 5. The ratio of number of boys and girls in a school is 5:4. If the number of boys is 180, find the number of girls.
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The ratio of number of boys to the number of girls in a school of 1440 students is 7:5.If 40 new boys are admitted,find how many new girls may be admitted to make this ratio 4:3
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Let the no. of boys=7x
No. of girls=5x
7x+5x=144012x=1440⇒x=120
∴ No. of boys=120×7=840
No. of girls=5×120=600
Let y be the no. of girls to be added
⇒34=600+y840+40⇒2400+4y=3320+120⇒4y=3440−2400=1040⇒y=41040=260
∴ no. of girls that needs to be added =260
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