batu bata lapisan atas (a) = 10
lapisan batu bata (n) = 32
batu bata yg sdh dipasang (S32) = 1312
batu bata yg plg bawah (U32) = ... ?
Sn = (1/2n)(a+Un) = (1/2 x 32)(10+U32) = 16(10+U32)
1312 = 16 (10+U32) = 160 + 16U32
1312 - 160 = 16U32
1152/16 = U32
U32 = 72 C
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a = 10
S32 = 1312
32/2 (2 x 10 + 31b) = 1312
16 (20 + 31b) = 1312
20 + 31b = 1312/16
20 + 31b = 82
31b = 82-20
31b = 62
b = 2
banyak batu bata pada lapisa paling bawah berarti :
U32 = a + 31b = 10 + 31(2) = 10 + 62 = 72
batu bata lapisan atas (a) = 10
lapisan batu bata (n) = 32
batu bata yg sdh dipasang (S32) = 1312
batu bata yg plg bawah (U32) = ... ?
Sn = (1/2n)(a+Un) = (1/2 x 32)(10+U32) = 16(10+U32)
1312 = 16 (10+U32) = 160 + 16U32
1312 - 160 = 16U32
1152/16 = U32
U32 = 72 C