Question

The cost of Mathematics book is Rs 25 3/4 and that of Science book is Rs 20 1/2. Which cost more and by how much?​

Answer 1

Cost of Science book is Rs 20 (1/2) i.e. (41/2) Now taking the LCM of 2 and 4 is 4 Now we have to convert the given fractions into its equivalent fractions with denominator 4 Mathematics book cost is Rs (103/4) Science book cost is Rs (41 × 2/2 × 2) = (82/4) (103 – 82)/4 = 21/4 = 5 (1/4) Hence the cost of Mathematics book is more than cost of Science book by 5 (1/4)

Answer 2

Mathematics book is more costlier.

Step-by-step explanation:

cost of mathematic book =Rs 25 3/4 =Rs 103/4

cost of science book =Rs 20 1/2 =Rs 41/2

change the cost of both the books into like fraction

mathematics cost =103*2/4*2=206/8

science cost =41*4/2*4=164/8

hence denominator are same

206/8 is greater than 164/8

there fore cost of math book is more than the cost of science book.