Question

16.
An electric contractor purchases a
mactor purchases a certain amount of wire. 10% of which is stolen.
After using 85% of the remainder, ne ne
er the remainder, he had 2.7 metres of it left. How much wire did
he purchase?
A. 10 metres
B. 20 metres
C. 30 metres
D. 40 metres
17.
In a garden, there are 10 rows and 12 columns of mango trees. The distance
between the two trees is 2 metres and a distance of one metre is left from all sides
of the boundary of the garden. The length of the longer side of the garden is:
A. 20 metres
B. 22 metres
C. 24 metres
D. 26 metres
18.
In a school, 25% of students in division A are girls, as are 40% of division B. If the
strength of division A is 40, and that of division B. 60. what is the proportion of giris
in a combined class with both division A and division B?
A. 20
B. 34​

Answer 1

Answer:

Let

Total were =100

10%of100=10 stolen

Remaining=100-10=90

Used=85%of90=76.5

Now left with=90-76.5=13.5

13.5=2.7(given)

100=2.7/13.5×100=20m

School A=40

25%=1/4

Girls=1/4×40=10

School B=60

40%=2/5

Girls=2/5×60=24

Total girls=24+10=34