Let's say Mary's brother's age is x and Mary's age is y
(1) x = 3y - 5
(2) x + y = 39
Now if we substitute equation (1) into equation (2) we get:
3y - 5 + y = 39
4y = 44
y = 11
Therefor Mary is 11 years old
Answer:
Step-by-step explanation: five hundred two thousand and nine hundred
¾ = 75% of x
x = (¾)/75% = (¾)/0.75 = 0.75/0.75 = 1
Answer: 4.023 litres
Step-by-step explanation:
Find out what a quarter of the capacity of the tank is first:
= 5,364 * 1/4
= 1,341 ml
The number of ml left to fill up the tank is:
= 5,364 - 1,341
= 4,023 ml
1 litre = 1,000 ml
4,023 ml in litres = 4,023 / 1,000
= 4.023 litres
Answer:
136
Step-by-step explanation:
theory: sum of opposite interior angles is equal to exterior angle
do oh understand?
