1) find the reciprocal of 1 whole 7 by 8
2) simplify 4 wholenumber 1 by 2 mulitply 3 wholenumber 1 by 5 mulitply 1 by 3
3) ricky finised her homework in 5 by 12 hours and babli finshed her homework in 3 by 4 hours . who took longer time and how much longer?
4) subtract 8 wholenumber 2 by 12 from 9 whole number 1 by 7
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Answer:
1) 8/15
2) 4 whole 4/5
3) Babli took longer time by 1/3 hours
4) 41/42
Step-by-step explanation:
1) 1 whole 7/8 = 15/8
Reciprocal of 15/8 is 8/15
2) 4 whole 1/2=9/2 ; 3 whole 1/5=16/5 ; 1/3
9/2×16/5×1/3 = 24/5 = 4 whole 4/5
3) Ricky = 5/12 hrs
Babli = 3/4 hrs
5/12=5×1/12×1 = 5/12
3/4=3×3/4×3 = 9/12
9/12>5/12
Thus Babli took longer time by = 9/12-5/12
=9-5/12
= 4/12
= 1/3 hrs
4) 9 whole 1/7 = 64/7
8 whole 2/12 = 8 whole 1/6 = 49/6
∴ 64/7-49/6
(LCM of 7 and 6 = 42)
= (64×6)-(49×7)/42
= 384-343/42
= 41/42 (ans)
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