Circular based pyramid I believe
Answer:
23+4x=87 x=16
Step-by-step explanation: 16 weeks he has to save up.
Answer:
21 mails
Step-by-step explanation:
Let there are x no of texts and y no of emails.
Condition 1,
x+y = 20 ...(1)
Condition,
x=2y-1 ...(2)
Put the value of x from equation (2) in (1). So,
(2y-1)+y = 20
Taking like terms together,
2y-y=20+1
y=21
So, Devin sent 21 mails,.
3 periods, 20 minutes each
20 * 3 = 60 minutes
12 minutes per period
12 * 3 = 36
So the ratio is 36:60, or simplified: 3:5
