Question

q. no 9,10,11 and 12

Answer 1

9. 1/5 th of students are absent=1/5*60=12
7/12 have raincoat=7/12*48=28
48 students are present 28 students have raincoat 20 students did not have raincoat
10.
5/7* Total spectator=15000
total spectator=21000
11.
Robert monthly income X
spent for food=3/8*x
remaining amount=5/8*x
spent for rent =3/10*5/8*X=3/16*x
total spent=9/16*x
left=7/16*x
amount=7/16*x=3570
X=8160

12.boys=2/5*girls
boys/girls=2/5
no.of boys=2/7*56=16
girls=40

Answer 2

9. given,

Total students of the class=60

Absented students=1/5 * 60 = 60/5 = 12

Presented students = 60-12 =48

Students bring raincoat = 7/12 * 48 = 28

Students didn't bring raincoats = 48-28 = 20

10. given,

let the total spectators be x

Spectators in the covered stand = 2/7 x

Spectators in the open = x - 2/7 x

=7x-2x/7

=5x/7

but, Spectators in the open = 15000

=>5x/7=15000

=>x=21000

The total spectators are 21000

11. given,

let the monthly income be x

Robert spent on food = 3/8 x

Remaining = 1 - 3/8x =8x-3x/8 =5x/8

Money spent on household = 5x/8 * 3/10

=3/16 x

Money spent = 3/8 x + 3/16 x

=6x+3x/16

=9x/16

Money left = x- 9x/16 = 16x-9x/16 = 7x/16

Money left = 3570/-

=>7x/16 = 3570

=>x=8160/-

Robert get 8160/- per month

12. given,

Total no. of students = 56

let number of girls be x

number of boys = 2/5 x

No. of students = 56

=>no. of girls + no. of boys = 56

=>x + 2/5 x = 56

=>5x+2x/5=56

=>7x/5=56

=>x=40

no. of boys = 2/5 x = 2×40/5 = 16

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