Berikut ini adalah pertanyaan dari blablaomo pada mata pelajaran Matematika untuk jenjang Sekolah Menengah Pertama
3. Raju buys 1000 apples at $1 per apple. 25% of the apples are rotten. Find the selling price per apple if he wants to earn an 50% profit on the cost price.
4. If p ∶ q = 3 ∶ 4 and q ∶ r = 6 ∶ 5, then p ∶ q ∶ r =
5. In a school of 1200 students, the ratio of the number of teachers to students is 1 : 15. After some teachers join the school, the ratio of the number of teachers to students becomes 3 : 40. Find the number of teachers who join the school.
Jawaban dan Penjelasan
Berikut ini adalah pilihan jawaban terbaik dari pertanyaan diatas.
1. Dik : Total Salary = $500
Total Spent = 20% + 15% = 35%
Other Expense = $25
Dit : Remaining Salary ?
Ans : ( 100 - 35 )% x $500
= 65% x $500
= $325 - $25
= $300
2. 10% of 2500 = 250
The number is first increased by 10%
so the number become = 2500 + 250
= 2750
The value obtained is next decreased by 20%
Now, 20% of 2750 = 550
The final number is = 2750 - 550
= 2200
3. 1000 apples at $1 per apple
25% apples are rotten
= 1000 x 25%
= Sisa Apel = 750
He wants 50% profit on the cost price
= 50% x 1000
= 500
= 1000 + 500
= 1500
Divide with remaining apples
= 1500/750
=$2
So, he must selling $2 for earn 50% profit
4. P : Q = 3 : 4
Q : R = 6 : 5
P : R = ?
p : q = 3/4 x q : r = 6/5
= 18/20
So, P : R = 18 : 20
= 9 : 10
5. Initial number of teachers in the school
= 1200/15
= 80
The number of teachers who join the school
( 80 + x ) /3 = 1200/40
( 80 + x ) /3 = 30
80 + x = 90
x = 10
So, the additional number of teacher is 10
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Last Update: Sun, 05 Jun 22