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  1. If x : y = 2 : 5, then (5x + 3y) : (5x – 3y) is equal to
    1. 5
    2. 3
    3. –3
    4. –5
Correct Option: D

x
 =
2
 (Given)
y5

∴ 
5x + 3y
5x − 3y

= 5
x
 + 3
y
5
x
 − 3
y

(Dividing numerator and denominator by y)
= 5 ×
2
 + 3
5
5 ×
2
 − 3
5

=
2 + 3
 = −5
2 − 3

Second Method :
Marks of Q =
n
 × R
m

(Where m = 2, n = 5, R = 120)
=
5
 × 120 = 300
2


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