Question

going the same distance. Find the
circumference of each wheel.
viii) Last year the total number of students in a
school was 5000. This year, the number of
boys increased by 5% and that of girls by 3%
and the total number of students increased
by 202. How many boys and girls were there
in the school last year?
ANSWERS​

Answer 1

Answer:

STEP 1: Define x and y:

Let the number of boys be x

and the number of girls be y

.............................................................................................

STEP 2: Form equations:

x + y = 5000

005x + 0.03y = 202

.............................................................................................

STEP 3: Solve x and y:

x + y = 5000 ---------------------------------- [ 1 ]

0.05x + 0.03y = 202 --------------------- [ 2 ]

.

From [ 1 ]:

x + y = 5000

x = 5000 - y --------------------- Sub into [ 2 ]

.

0.05x + 0.03y = 202

0.05 ( 5000 - y) + 0.03y = 202

250 - 0.05y + 0.03y = 202

0.02y = 48

y = 2400 -------------------- Sub into [ 1 ]

.

x + y = 5000

x + 2400 = 5000

x = 2600

.............................................................................................

STEP 4: Find the number of boys and girls:

Boys = x = 2600

Girls = y = 2400

.............................................................................................

Answer: There were 2600 boys and 2400 girls last year.