CAT 2021 Number System Question (Medium)

Question

A box has 450 balls, each either white or black, there being as many metallic white balls as metallic black balls. If 40 of the white balls and 50 of the black balls are metallic, then the number of non-metallic balls in the box is

Accepted Answer

Step 1 Let the number of white balls be and black balls be . Given Also, number of metallic white balls number of metallic black balls. Metallic white balls of Metallic black balls of Therefore Multiply both sides by 10 Thus Substitute into Then Step 2 Metallic white balls Metallic black balls So no

CAT 2021

Quantitative

Number System

Medium

A box has 450 balls, each either white or black, there being as many metallic white balls as metallic black balls. If 40% of the white balls and 50% of the black balls are metallic, then the number of non-metallic balls in the box is

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