Question

$\huge\bold\pink{ANSWER \: \: THIS \: \: -}$


Q. 28 m - 3 n = ______


$\huge\mathtt\red{SPAMMERS \: \: STAY \: \: AWAY \: \: !}$
​

Answer 1

$\huge\fbox{\fbox{\fbox{Answer}}}$

Given, n varies directly as m

∴ n ∝ m

∴ n = km …(i)

where, k is the constant of variation

i. When m = 3, n = 12

∴ Substituting m = 3 and n = 12 in

(i), we get n = km

∴ 12 = k × 3 ∴ k = 12/3

∴ k = 4 Substituting, k = 4 in

(i), we get n = km

∴ n = 4m …

(ii) This is the equation of variation. ii. When m = 6.5, n = ?

∴ Substituting, m = 6.5 in

(ii), we get n = 4m

∴ n = 4 × 6.5

∴ n = 26

iii. When n = 28, m = ?

∴ Substituting, n = 28 in (ii), we get n = 4m

∴ 28 = 4m

∴ m = 28/4 m = 7

iv. When m = 1.25, n = ?

∴ Substituting m = 1.25 in

(ii), we get n = 4m

∴ n = 4 × 1.25

∴ n = 5