BPSC PRELIMS MATH QUIZ -4

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Question 1:

If $x$ is positive and $\frac{x}{\sqrt{243}}=\frac{\sqrt{2187}}{x}$, then what is the value of $x$?

Question 2:

The HCF of two numbers is 6 and the LCM is 108, if one number is 12 then find the other number.

Question 3:

In an alloy of German silver, the ratio of copper to zinc was $21: 16$ while that of nickel to zinc was $7: 24$ What was the ratio of copper to zinc to nickel in the alloy?

Question 4:

The marked price of a toy was ₹ 2100, on which two successive discounts $20 \%$ and $15 \%$ were given during the sale. What was the selling price of the toy?

Question 5:

In still water, Rajni can row $135 \mathrm{~km}$ in $7.5$ hours, while she can row $48 \mathrm{~km}$ upstream in 4 hours. What is the speed of the current in km/hr?