Question

saurav a class 12 student is preparing for an engineering entrance examination. he studies for 7*1/4 hours daily. she devotes 4*1/3 hours of his total study time for physics and chemistry and the remaining time for mathematics. how much time does he devotes for mathematics daily.

Answer 1

Time she devotes for studies = 7 1/4 hours

Time she devotes for physics and chemistry = 4 1/3 hours

Time she devotes for mathematics = (7 1/4) -(4 1/3) =

29/4 - 13/3

So we have to make the denominator equal

LCM of 4 and 3 is 12

(29×3/4×3) - (13×4/3×4) =

87/12 - 52/12 =

35/12 = 2 11/12 hours

So she devotes 2 11/12 hours for mathematics

Answer 2

Step-by-step explanation:

she devote time for studies =7 1/4

she devote time for physices and chemistry =4 1/3

she devote time for mathematics = 7 1/4 - 4 1/3

so we have to make the denominator equal

L.C.M of 4and 3 is 12

(29/4 × 3/3) - (13/3×4/4)

(87/12 - 52/12)

35/12

2 11/12