Question

4.
a. If 2:9::x::27, find the value of x.
b. If 8:x::16::35, find the value of x.
c. If x:35 :: 48 ::60, find the value of x.
5.
Find the third proportional to the following numbers.
a. 36 and 54
b. 27 and 36
c. 7 and 14.
6.
Find the mean proportional between the following numbers.
a. 9 and 16
b. 0.4 and 0.9
C. 21 and 84
7.
If the cost of 15 books is 240, find the cost of 39 books.​

Answer 1

Answer:

Q. 7

cost of 15 books =240

so, cost of 1 book=240/15=16

now, cost of 39 books=39*16=624