Answer:
Roy is 10 years old at present and Joan is 5 years old at present
Step-by-step explanation:
Let
x----> Roy's age
y----> Joan's age
we know that
x=2y ----> equation A
(x+3)+(y+3)=21 ----> equation B
substitute equation A in equation B
(2y+3)+(y+3)=21
solve for y
3y+6=21
3y=21-6
3y=15
y=5 years
Find the value of x
x=2y ----> x=2(5)=10 years
therefore
Roy is 10 years old at present
Joan is 5 years old at present
The answer is 204 square units
Answer:
8 can go into eighteen 2.25 times
Answer: 110 mph
Step-by-step explanation: 275 / 2.5 = 110 mph
Answer:
0.5cm
Step-by-step explanation:
Using the sine rule
