Multiple 120 by 5.
1) 60, 2) 125, 3) 600, 4) 1205

Alarge rectangle is divided into four smaller rectangles.

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

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°