Study the given table and answer the question that follows.

The table shows the number of different electronic items sold in four different showrooms named P, Q, R and S.

Showrooms	Geysers	TVs	Ovens	Fans	ACs
P	910	1658	2540	4520	680
Q	1555	2580	1820	2020	520
R	1430	1890	1950	4200	740
S	2050	3200	1820	2015	850

What is the ratio of the following?

Total geysers sold by showrooms P and R: Total ovens sold by R and S.