Question

if V=7 , F=9 . find E .
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Answer 1

Sol: (i) Here, V = 6 and E = 12

Since F + V – E = 2

∴F + 6 – 12 = 2

or F – 6 = 2

or F = 2 + 6 = 8

(ii) Here, F = 5 and E = 9

Since F + V – E = 2

or 5 + V – 9 = 2

or V – 4 = 2

or v = 2 + 4 = 6

(iii) Here F = 20 V = 12

Since, F + V – E = 2

∴20 + 12 – E = 2

or 20 + 12 – E = 2

32 – E = 2

or E = 32 – 2 = 30