Question

10. Find the value of (a + b + c) -d; if the following
(ii) 10, b, 24, 60
(iv) 72, 144, 24, d
are in proportion.
(i) a, 30, 40, 60
(iii) 12, 48, c, 36

Answer 1

x:5 a 3 8 c 15

y:24 10 40 b 20 d; x and y are proportional. Find the value

Correct option is C)

xy=5×24=3×40=120=k

⇒x is inversely proportional to y. [because product is constant]

⇒5×24=10a=3×40=8b=20c=15d=120

⇒ c=

20

120

=6

⇒d=

15

120

=8

⇒d−c=8−6=2