Question

10 students of Class-X took part in a mathematics quiz. If the number of girls is 4 more than the number of boys then, find the number of boys and the number of girls who took part in the quiz.

Answer 1

Let the number of boys took part in a mathematics quiz is x
and number of girls took part in a mathematics quiz is y .

total number of students took part in a mathematics quiz = 10
e.g.,. x + y = 10 ........(1)

a/c to question, if number of girls is 4 more than the number of boys.
y = x + 4 ............(ii),

solving equations (i) and (ii),
x + x + 4 = 10
=> 2x + 4 = 10
=> 2x = 10 - 4 = 6
=> x = 3. and y = 7.

hence, number of boys = 3
number of girls=7

Answer 2

Hello,

Answer:
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Girls = 7
Boys = 3


Solution:
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let the number of girls are x and number of boys are y ,then

Total Student are 10, I.e.

$x + y = 10$
if y boys are taking part then girls are y+4
$y + y + 4 = 10 \\ 2y + 4 = 10 \\ 2y = 10 - 4 \\ 2y = 6 \\ y = 3$


put the value of y into eq 1
$x + y = 10 \\ x + 3 = 10 \\ x = 10 - 3 \\ x = 7$

girls are 7 and boys are 3 who take part in mathematics quiz.

Hope it helps you.