4:105
7:15
20:21
2:35
3:20
Correct answer is B
p:q=13:12
pq=23
2q=3p...(1)
q:r=25:47
qr=25×74=710
10q=7r...(2)
Eliminating q, we have
(1) : 2q=3p
10q=15p
⟹15p=7r
∴pr=715
p:r=7:15
Given that logp = 2 logx + 3logq, which of the following expresses p in terms of x and q? ...
A car dealer bought a second-hand car for 250,000 and spent N 70,000 refurbishing it. He then s...
A boy walks 800m in 20 minutes. Calculate his average speed in Km/H ...
Calculate the standard deviation of the following data: 7, 8, 9, 10, 11, 12, 13. ...
If log 2 = 0.3010 and log 2y = 1.8062, find; correct to the nearest whole number, the value of ...
If yα1x2 and y=114 when x = 4, find the value of y when \(x = \f...
Find the equation of the line through the points (5, 7) parallel to the line 7x + 5y = 12. ...