What should come in place of question mark (?) in the following number series ?
Multiples of 2.3 are added and subtracted alternatively
22 $$- 2.3 \times 1$$ = 19.7
19.7 $$+ 2.3 \times 2$$ = 24.3
24.3 $$- 2.3 \times 3$$ = 17.4
17.4 $$+ 2.3 \times 4$$ = 26.6
26.6 $$- 2.3 \times 5$$ = 15.1
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