10 / 4 is a fraction, and with fractions, you can reduce or increase the numerator and denominator as long as you keep the same ratio. For instance 2/4 is the same as 1/2 because 2 is half of 4 and 1 is half of 2. An easy way to find equivalent fractions is to divide or multiply the top and bottom by the same value. For the example I used, if I multiply 1/2 by 2/2 I get 2/4 which is equivalent. In this case you can either multiply 10/4 by something like 2/2 and get 20/8 or you can divide 10/4 by 2/2 and get 5/2.
Answer: 9 boys remained in the choir.
Step-by-step explanation:
Let x be the number of of boys and y be the number of girls.
In a school choir, 1/2(half) of the members were girls.
i.e (1)
At the end of the year, 3 boys left the choir, and the ratio of boys to girls became 3:4.
Put y= x from (1), we get
Thus , the number of boys : x= 12
Boys remained in the choir = 12-3=9
20 mins means the hand moves 120 degrees around the clock.
The formula to find the arc length is 2pi×r×a/360
2×pi×15×1/3=30pi×1/3=10pi
so i think the answer would be 10 pi cm
Step-by-step explanation:
question no. 21 answer
8 units
Answer:
The constant of variation is 2
Step-by-step explanation:
The equation of the direct variation is y = k x, where k is the constant of variation
<em>Let us solve the question</em>
∵ x and y are in the direct variation
→ Use the form of the equation above
∴ The equation of variation is y = k x
∵ x = 3
∵ y = 6
→ Substitute them in the equation above
∴ 6 = k (3)
∴ 6 = 3k
→ To find k divide both sides by 3
∵ =
∴ 2 = k
∵ k is the constant of variation
∴ The constant of variation is 2