1.20
从第二个数起,每个数都是前一个数的每一位的平方和
16=0^2+4^2
37=1^2+6^2
58=3^2+7^2
…………
第七个数为1^2+4^2＋5^2=42
第八个数为4^2+2^2=20
第9个数为2^2+0^2=4
2.problem
P is in SPEAK and also in PROSE
R is in EAR but isn't in NOSE
O is in OLD as well as in YOUNG
B is in LOB and also in BUNG
L is in EARLY and also in LATE
E is in FENCE as well as in GATE
M is in MONKEY but isn't in PUZZLE
PROBLEM is something that might cause you trouble.