Question

Seven times a number is six less then thirteen times the same number. Find the number

Answer 1

Answer:

if an object of 7 cm heght is placed at a distance of 12 cm from a convex lens of focal length 8 cm foind the position,nature and height of image

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Answer 2

7x - 13x

because 7 times a number so the number is unknown to us so 7x and then less then so subtraction  - and 13 times the same number so again the same number is unknown and it will be same as 7x so 13x

the answer is 7x - 13x