90 men can complete a work in 24 days working 8 hrs a day. how many men are required to complete the same work in 18 days working 15/2 hrs a day

128 men

Step-by-step explanation:

90 × 28 × 8 = M × 18 × 15/2

M = 128

yx = 36

step-by-step explanation:

cos f = opposite side/ hypotenuse

cos f = yw / yx

we know cos f = 4/9 and yw =16

4/9 = 16/yx

multiply each side by yx

4/9 yx = 16/ yx * yx

4/9 yx = 16

multiply each side by 9/4

9/4 * 4/9 yx = 16 *9/4

yx = 36