# NCERT Exemplar Solutions Class 6 Mathematics Solutions for Exercise in Chapter 4 - Fractions and Decimals

Question 4 Exercise

Which of the following is not in the lowest form? (A) 7 /5

(B) 15/20

(C) 13/33

(D) 27/28

(B) 15/20

Divide both numerator and denominator by 5.

Video transcript
"hello students welcome to lido q a video session i am saf your math tutor and question for today is the radius of the cone is 7 centimeter area of curved surface is 176 centimeter square find the slant height we know that the radius of the cone is given and curved surface area is also given so here radius of the cone let us consider it as r which is equal to 7 centimeter and curved surface area of cone let us consider it as i'll write down here c as a that is curved surface area which is equal to 176 centimeter square now we know that curve surface area is equal to pi rl hence here we need to find the slant height so your slant height l will be equal to curved surface area divided by pi into r which is equal to 176 divided by 22 by 7 into 7 so your slant height l comes out to be 176 divided by that is 176 into 7 divided by 22 into 7 and that is equal to l is equal to 176 upon 22 that you will simplify and you will get l is equal to eight so slant height of given cone that is l will be equal to a centimeter if you have any doubt you can post it in our comment section and subscribe to leto for more such interesting q a thank you for watching"
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