Tag: maths

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Questions Related to maths

Multiple choice maths operations adding and subtracting numbers using place value addition & subtraction mental additions and subtractions

If three is subtracted from each of the following numbers, then which of the following options is the difference between the second highest number and the second digit of the highest number?
$489$     $541$     $654$      $935$       $873$.

  1. $0$
  2. $3$
  3. $1$
  4. $4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Given Numbers  489  541  654  935  873
 Subtraction  -3  -3  -3  -3  -3
 Required Numbers  486  538  651  932  870

Highest Number $\rightarrow$ $932$

Second digit of $932$  $\rightarrow$ $3$
Second highest Number $\rightarrow$ $870$
Second digit of $870$ $\rightarrow$  $7$ 
Difference between 7 and 3 $\rightarrow$ $4$
Hence, the required answer is $4$.

Multiple choice maths operations adding and subtracting numbers using place value addition & subtraction mental additions and subtractions

The population of a city is $2,09,32,714$. Out of these, $90,47,314$ are men; $984,35,784$ are women and the rest are children. Find the number of children in the city.

  1. $34,94,616$
  2. $34,49,616$
  3. $34,49,661$
  4. $34,94,661$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Population of City $\rightarrow$ Number of Men $+$ Number of Women $+$ Number of Children

Population of city $\rightarrow$ $2,09,32,714$
Number of Men $\rightarrow$ $90,47,314$
Number of Women $\rightarrow$ $84,35,784$
$2,09,32,714$ $\rightarrow$  $90,47,314$ $+$ $84,35,784$ $+$ Number of children
Number of Children $\rightarrow$ $3449616$
Hence, Option B is correct.

Multiple choice maths operations adding and subtracting numbers using place value addition & subtraction mental additions and subtractions

Select the INCORRECT statement.

  1. Tina has $1556$cm long cloth. She cut $13$m $50$cm from it. The length of cloth left with her is $2.06$m
  2. Neetu bought $500$g potatoes, $250$g capsicums, $700$g onions, $500$g tomatoes, $100$g gingers and $300$g radish. The total weight of the vegetables she bought is $2.350$kg
  3. Rita got Rs. $500$ and spent Rs. $117.35$ on stationary items and Rs. $50.75$ on eatables. The amount left with Rita is Rs. $331.09$
  4. Yashika has to cover a distance of $20$km $50$m. She walked $1$km and went by bus for $15$km and hired an auto for rest of the distance. The distance she covered by auto is $4.05$km
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(A) Total length of cloth Tina had $=1566$cm $=15.56$m
Length of cloth she cut from it $=13$m $50$cm
$=13.50$m
$\therefore$ Length of cloth left with her $=15.56-13.50$
$=2.06$m
(B) Total weight of vegetables Neetu bought $=500g+250g+700g+500g+100g+300g=2350$g i.e., $2.350$kg
(C) Total amount spent by Rita$=Rs. (117.35+50.75)=Rs. 168.10$
Amount left will Rita $=Rs. (500-168.10)$
$=Rs. 331.90$
(D) Total distance covered by Yashika $=20$km $50$m $=20.050$km
Distance covered by auto $=20.050-(1+15)=20.050-16=4.05$km
So, option (C) is incorrect.

Multiple choice maths operations adding and subtracting numbers using place value addition & subtraction mental additions and subtractions

Rita's watch was 10 minutes fast.Her watch showed 1:05 p.m.when she left home.She travelled for 35 minutes and arrived 5 minutes early for her dental appointment.At what time was her dental appointment?

  1. 13 : 20 hrs

  2. 13 : 25 hrs

  3. 13 : 35 hrs

  4. 13 : 55 hrs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rita's watch was 10 min fast 

when she left home her watch shows time 1:05 p. m
then actual time when she left home is=$ 1:05 p.m.-10 min=12:55 p.m.$
now she travelled 35 min then the time goes to=$ 12:55 p.m.+35 min= 13:30 p.m.$
now she reach at dental hospital 5 min. before the,
actual time was her dental appointment= $13:30 p.m.+5min.=13:35$ hrs


Multiple choice maths operations adding and subtracting numbers using place value addition & subtraction mental additions and subtractions

If 300 jellybeans cost you x dollars. How many jellybeans can you purchase for 50 cents at the same rate?

  1. 150/x

  2. 150x

  3. 6x

  4. 1500/x

  5. 600x
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • $1$ dollar is equal to $100$ cents
  • Given $300$ jellybeans is equal to $x$ dollar , which implies $100x$ cents
  • For $50$ cents , we get $300/2x = 150/x$ jellybeans
Multiple choice maths average arithmetic mean of ap introduction to averages means

The $A.M.$ of the observations $1.3.5,3.5,7,9,.,(2n-1)(2n+1) (2n+3)$ is $(\forall\ n\ \in\ N)$

  1. $2n^{3}+6n^{2}+7n-2$
  2. $n^{3}+8n^{2}+7n-2$
  3. $2n^{3}+5n^{2}+6n-2$
  4. $2n^{3}+8n^{2}+7n-2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The arithmetic mean of a sequence is the sum of terms divided by the number of terms. For the given series, calculating the sum and dividing by n yields the expression in option D.

Multiple choice maths average arithmetic mean of ap introduction to averages means

The mean of ${1^{2,}}{2^2},{3^2},{4^2},{5^2},{6^2},{7^2}$ is:

  1. 10

  2. 20

  3. 30

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sum of squares of the first 7 natural numbers is 1^2 + 2^2 + 3^2 + 4^2 + 5^2 + 6^2 + 7^2 = 1 + 4 + 9 + 16 + 25 + 36 + 49 = 140. The mean is 140 / 7 = 20.