En 13. The mean (average) weight of 5 boys is
160 pounds. If three of the boys weigh
152, 158, and 168 pounds respectively,
which of the following could be the weights,
in pounds, of the other two boys?
165 and 150
(2) 162 and 156
(3) 160 and 162
(4) 157 and 168
(5) 155 and 172
.
ea?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.

Find two numbers if their ratio is 4: 7 and their difference is 123.