23 girls have a mean height of 153cm 17 boys have a mean height of 165cm

work out the mean of all 40 children?

plzz help me!!!
pleaseee

Mean height of 159

Step-by-step explanation:

Add 153 and 165, then divide by 2 to find the average of 159.

marco saved more.   he saved $35 more.

step-by-step explanation:

1+2+3+4+5+6+7+8+9+10 = 55

2*10 = 20

55-20 = 35

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it