Tag: how many in all?

Quizzes (0) Questions (48)

Questions Related to how many in all?

Multiple choice maths calculating and mental strategies 3 finding percentage of a number how many in all? problems on percentage

Two numbers are less than a third number by $30\%$ and $37\%$ respectively. How much percent is the second number less than the first?

  1. $10\%$
  2. $15\%$
  3. $20\%$
  4. $25\%$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let the $3rd$ number be $100$. Then,


$1st$ number $= 70$ and $2nd$ number $= 63$

$2nd$ number is less than 1st by $(\dfrac{7}{70}\times 100)=10 \%$

Multiple choice maths calculating and mental strategies 3 finding percentage of a number how many in all? problems on percentage

Choose the correct answer from the alternative given. 
A man had $100$ kgs of sugar, part of which he sold at $7\%$ profit and rest at $17\%$ profit. He gained $10\%$ on the whole. How much did he sell at $7\%$ profit?

  1. $65$kg
  2. $35$kg
  3. $30$kg
  4. $70$kg
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using the allegation method: the profit percentages are 7 and 17, with a mean of 10. The ratio of quantities is (17-10) : (10-7) = 7 : 3. Total parts = 10, so 7/10 of 100kg = 70kg.

Multiple choice maths calculating and mental strategies 3 finding percentage of a number how many in all? problems on percentage

$83.33\% $ of coins out of $36$ coins are $20$ paise coins and rest are $10$ paise coins which amounts to $6.60$. Find the number of $10$ paise coins.

  1. $8$
  2. $5$
  3. $6$
  4. $2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given : $83.33$% of $36$ coins are $20$ paisa coins

$83.33$% of $36 =\left( \cfrac { 83.33 }{ 100 }  \right) \times 36=30$

So, $30$ coins are $20$ paise coins and remaining $(36-30)= 6$ coins are $10$ paise coins.

Value $=30\times 20+6\times 10=660$ Paise $=Rs. 6.60$, which is the given amount.

$\therefore $ Number of $10$ paise coins are $6$.

Multiple choice maths calculating and mental strategies 3 finding percentage of a number how many in all? problems on percentage

Choose the correct answer from the alternatives given.
The average age of eleven cricket players is 20 years. If the age of the coach is also included, the average age increases by 10%. The age of the coach is

  1. 48 year

  2. 44 year

  3. 40 year

  4. 36 year
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Average of 11 players $= 20$ years.
Sum of age of 11 players $= 20 \times 11 = 220$
Average age of players and coach $1.1 \times 20 22$ years
Sum of ages of players & coach $= 22 \times 12 = 264$ years.
Age of coach $= 264 - 220 = 44$ years.