Percentage Practice Test 3 with solutions

Question : 37 of 40

Marks: +1, -0

A bag contains 20 pens and 30 pencils. How many pencils must be added in the bag so that 75% of the total products are pencils?

Solution:

Let x pencils be added

∴{20+x}/{30+x}=75/100=3/4

80 + 4x = 90 + 3x

x = 10

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