NCHMCT JEE 2015 Question Paper with solutions for online practice

Question : 18 of 200

Marks: +1, -0

Solve for a; 2.7% of 300 + .03% of 400 – a = 12.2% of 10

Solution:

{2.7}/{100}

× 300 +

{.03}/{100}

× 400 - a =

{12.2}/{100}

× 10
⇒ 2.7 × 3 + .03 × 4 – a = 1.22
⇒ 8.1 + .12 – 1.22 = a
⇒ 8.22 – 1.22 = a
⇒ a = 7.

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