Question

answer the above question ​

Answer 1

Answer:

Step-by-step explanation:

Q7:

a) 1/12 + 5/12 + 7/12 = 13/12 = 1 1/12

b) 1 1/2 +2 1/3 + 6/15

   LCM of 2 ,3 , 15 is 30

    so,1 1/2 +2 1/3 + 6/15 = 3/2 + 7/3 + 6/15 = 45/30 + 70/30 + 12/30 = 127/30

                                                                                                              = 4 7/30

c) 2 1/3 + 3 1/2 - 1 1/4

  LCM of 3 ,2 , 4 is 12

so, 2 1/3 + 3 1/2 - 1 1/4 = 7/3 + 7/2 - 5/4 = 28/12 + 42/12 - 15/12 = 55/12 = 4 7/12

d) 5/7 - 8/35

LCM of 7 and 35 is 35

5/7 - 8/35 = 25/35 - 8/35 = 17/35

e) Qc and Qe are same questions

f) 2 1/2 x 3 1/4 = 5/2 x 13/4 = 65/8 = 8 1/8

g) 10 x 4 1/4 = 10 x 17/4 = 170/4 = 85/2 = 42 1/2

h) 5/9 x 5/8 = 25/72

i) 1/8 of Rs.756 = 1/8 x 756 = 756/8 = Rs. 94.50

j)3/5 of 62 1/2m = 3/5 x 62 1/2 = 3/5 x 125/2 = 375/10 = 75/2 =37 1/2 m

k) 5/8 ÷  2/3 = 5/8 x 3/2 = 15/16

l) 11/13 ÷ 22 = 11/13 x 1/22 = 1/26 (after cross cancellation)

m) 6 1/4 ÷ 2 1/4 = 25/4 ÷ 9/4 = 25/4 x 4/9 = 25/9 = 2 7/9

n) 100 ÷ 10/7 = 100 x 7/10 = 70