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Method :-- (1) BASIC,
Boy : Girl
20% 15% fail
80% : 85% pass
80x - 85y = 7000-----(1)
20x + 15y = 9000 -----(2)
y = 200,,, x = 300
So total student = 500 ✅
Method :- (2)
90×100/500 = 18%
20 15
18
3. 2.
300×80% = 240
200×85% = 170
240 - 170 = 70
So, 500 ✅
Method :- (3)
16B -17G = 14
4B+3G = 18)×4
G = 2,
100G = 200
B = 300
Total Student = 300+200 = 500✅
Method :- (4)
4 : 1
-17 : 3
-----------
70. ; 90
29 = 1740
5 = 300 boys
4 = 240
17 = 170
20 = 200 girls
300+200 = 500 Total✅
Method (5) :-
20% < 90 > 15%
Nhi20% = 90
100% = 450
100% = 600
Means = 450 < 500 > 650
So 500 ✅
Method (6) :- (Digital sum)
8 - 4 = 7
2 - 3 = 9
6 - 8 = 21 - 36
1 = 300 ---> Boy
1 = 200 ----> Girl.
Tw = 500 ✅
Method (7) :- (Baby digital sum)
2. 6 = Fail
8. 4 = Pass
2 - 6 = 7
8 + 4 = 9
2 = 1
1 = 5
Tw = 500 ✅
