Question

The length of an elastic string is ‘a’ metre when the tension is 4 newton,

and ‘b’ metre when the tension is 5 newton. The length in metres when

the tension is 9 newton is :

(1) 4a – 5b

(2) 5b – 4a

(3) 9b – 9a

(4) a + b
​

Answer 1

Answer:

b

Explanation:

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Answer 2

Answer:

fourth money is a + b ninth one is AB