Fractions
- If 0.3+ 0.6 + 0.7 + 0.8 = x, then x is equal to ?
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0.3+ 0.6 + 0.7 + 0.8 = x,
⇒ x = 3/9 + 6/9 + 7/9 + 8/9 = 24/9 = 8/3Correct Option: B
0.3+ 0.6 + 0.7 + 0.8 = x,
⇒ x = 3/9 + 6/9 + 7/9 + 8/9 = 24/9 = 8/3 = 22/3
- From a rope 30 m long, a person cuts off as many pieces as possible, each 31/4 m long. What fraction of the whole will be left ?
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Length of each piece = 31/4 = 13/4 m
Maximum pieces that can be cut = 30/(13/4) = 9
∴ Rope left = 30 - 13/4 x 9 = 120 - 117/4 = 3/4 m
∴ Required fraction = 3/4/30 = 1/4Correct Option: A
Length of each piece = 31/4 = 13/4 m
Maximum pieces that can be cut = 30/(13/4) = 9
∴ Rope left = 30 - 13/4 x 9 = 120 - 117/4 = 3/4 m
∴ Required fraction = 3/4/30 = 1/4
- A scooter before overhauling requires 2/3 h service time every 45 days,while after overhauling it requires 2/3 h service time every 60 days. what fraction of pre-overhauling service time is saved in the latter case ?
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Time required for service before overhauling = 2/3h = 40 min in 45 days
and time required for service after overhualing =2/3h= 40 min in 60 days
Now,LCM of 45 and 60 = 180 days
time required for service before overhauling is 180 days = 40 xCorrect Option: D
Time required for service before overhauling = 2/3h = 40 min in 45 days
and time required for service after overhualing =2/3h= 40 min in 60 days
Now,LCM of 45 and 60 = 180 days
time required for service before overhauling is 180 days = 40 x 4 = 160 min
and time required for service before overhauling is 180 days =40 x 3 = 120 min
∴ fraction of time saved = 160 - 120/160 =40/160 = 1/4
- (1/4)th of number of boys and (3/8)th of number of girls participated in annual sport days in the school. What fractional part of total number of students participated ?
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Total number of students participated = (B/4 + 3G/4)
∴ Required percentage= (B/4 + 3G/4) / (B+G) x 100%Correct Option: D
Total number of students participated = (B/4 + 3G/4)
∴ Required percentage= (B/4 + 3G/4) / (B+G) x 100%
Clearly, given data is inadequate.
- In a village, (5/8)th of the population are adults,half of the adults are male,(4/5)th of adult females are illiterate. if 400 females are illiterate, then the population of the village is ?
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Let the population of village = N
Then, adult's population = 5N/8
and adult females = 1/2 x 5N/8 = 5N/16
∴ illiterate females = 4/5 of adult female population
⇒ 400 = 4/5 x 5N/16Correct Option: D
Let the population of village = N
Then, adult's population = 5N/8
and adult females = 1/2 x 5N/8 = 5N/16
∴ illiterate females = 4/5 of adult female population
⇒ 400 = 4/5 x 5N/16
⇒ N = (400 x 16)/4
∴ N = 1600